niumini qmk layout with adjust layer that doesn't work.

keymap.c

#include QMK_KEYBOARD_H

// Defines the keycodes used by our macros in process_record_user
#define _QWERTY 0
#define _LOWER 1
#define _RAISE 2
#define _ADJUST 16

enum custom_keycodes {
  QWERTY = SAFE_RANGE,
  LOWER,
  RAISE,
  ADJUST,
};


const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

	/* Layer 0
	 * ,-----------------------------------------------------------------------------------.
	 * | Esc  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Bksp |
	 * |------+------+------+------+------+-------------+------+------+------+------+------|
	 * | Tab  |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |  ;:  | Enter|
	 * |------+------+------+------+------+------|------+------+------+------+------+------|
	 * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |  ,<  |  .>  |  /?  | Shift|
	 * |------+------+------+------+------+------+------+------+------+------+------+------|
	 * | Ctrl |  GUI | Caps |  Alt |Layer1|    Space    |Layer2| Left | Down |  Up  | Right|
	 * `-----------------------------------------------------------------------------------'
	 */
	[_QWERTY] = LAYOUT_planck_mit(
		KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,  KC_T,   KC_Y,   KC_U,  KC_I,    KC_O,    KC_P,    KC_BSPC,
		KC_TAB,  KC_A,    KC_S,    KC_D,    KC_F,  KC_G,   KC_H,   KC_J,  KC_K,    KC_L,    KC_SCLN, KC_ENT,
		KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,  KC_B,   KC_N,   KC_M,  KC_COMM, KC_DOT,  KC_SLSH, MT(MOD_RSFT, KC_QUOT),
		KC_LCTL, KC_LGUI, KC_CAPS, KC_LALT, TT(_LOWER),  KC_SPC,   MO(_RAISE), KC_LEFT, KC_DOWN, KC_UP, KC_RGHT
  ),

	/* Layer 1
	 * ,-----------------------------------------------------------------------------------.
	 * |   `  |      | Home |  Up  | PgUp |      |  F6  |   7  |  8   |  9   |      |  DEL |
	 * |------+------+------+------+------+-------------+------+------+------+------|------|
	 * |      |      | Left | Down | Right|      |      |   4  |  5   |  6   |      | GPgUp|
	 * |------+------+------+------+------+------|------+------+------+------+------|------|
	 * |      |      | End  |      | PgDn |      |      |   1  |  2   |  3   |      | GPgDn|
	 * |------+------+------+------+------+------+------+------+------+------+------|------|
	 * | Reset|      |      |      |      |             |   0  |  0   |  .   |      |      |
	 * `-----------------------------------------------------------------------------------'
	 */
	[_LOWER] = LAYOUT_planck_mit(
		KC_GRV,  _______, KC_HOME, KC_UP,   KC_PGUP,  _______,   KC_F6, KC_7, KC_8, KC_9,   _______, KC_DEL,
		_______, _______, KC_LEFT, KC_DOWN, KC_RIGHT, _______, _______, KC_4, KC_5, KC_6,   _______, G(KC_PGUP),
		_______, _______, KC_END,  _______, KC_PGDN,  _______, _______, KC_1, KC_2, KC_3,   _______, G(KC_PGDN),
		RESET,   _______, _______, _______, _______,  _______,          KC_0, KC_0, KC_DOT, _______, _______
	),

	/* Layer 2 (r_ Indicates RGB Controls: r_TOG, r_Mode, r_Hue+, r_Hue-)
	 * ,-----------------------------------------------------------------------------------.
	 * |   ~  |   !  |  @   |   #  |   $  |   %  |   ^  |   *  |      |      |   -  | Bksp |
	 * |------+------+------+------+------+-------------+------+------+------+------+------|
	 * |   \  |   [  |  =   |   -  |   _  |   (  |   )  |   +  |      |      |      |      |
	 * |------+------+------+------+------+------|------+------+------+------+------+------|
	 * |      |   |  |   *  |   ]  |   &  |   {  |   }  |      |      |      |      |      |
	 * |------+------+------+------+------+------+------+------+------+------+------+------|
	 * |      |      |      |      |      |             |      |      |      |      |      |
	 * `-----------------------------------------------------------------------------------'
	 */
	[_RAISE] = LAYOUT_planck_mit(
 	  S(KC_GRV), S(KC_1),    S(KC_2), S(KC_3), S(KC_4),    S(KC_5),    S(KC_6),    S(KC_7),    _______, _______, KC_MINS, KC_BSPC,
      KC_BSLS,   KC_LBRC,    KC_EQL,  KC_MINS, S(KC_MINS), S(KC_9),    S(KC_0),    KC_PPLS,    _______, _______, _______, _______,
	  _______,   S(KC_BSLS), S(KC_8), KC_RBRC, _______,    S(KC_LBRC), S(KC_RBRC), _______, _______, _______, _______, _______,
	  _______,   _______,    _______, _______, _______,     _______,               _______,    _______, _______, _______, _______
  ),

  	/* Layer ADJUST - Doesnt work.
	 */
	[_ADJUST] = LAYOUT_planck_mit(
		_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
		_______, _______, _______, _______, _______, _______, _______, KC_MPLY, KC_VOLU, KC_VOLD, KC_MUTE, _______,
		_______, _______, _______, _______, _______, _______, _______, KC_M,    _______, _______, _______, _______,
		_______, _______, _______, _______, _______, _______,          _______, _______, _______, _______, _______
	)
};


bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case LOWER:
      if (record->event.pressed) {
        layer_on(_LOWER);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      } else {
        layer_off(_LOWER);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      }
      return false;
      break;
    case RAISE:
      if (record->event.pressed) {
        layer_on(_RAISE);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      } else {
        layer_off(_RAISE);
        update_tri_layer(_LOWER, _RAISE, _ADJUST);
      }
      return false;
      break;
    }
  return true;
}