Problem I'm having with userplot

dtwplot.jl

@userplot DTWPlot

@recipe function f(h::DTWPlot)
    seq1, seq2 = h.args
    i1,i2 = collect(1:length(seq1)),collect(1:length(seq2))
    
    # set up the subplots
    seriestype := :line
    legend --> false
    link := :both
    grid --> false
    layout --> @layout [
        leftplot  lineplot{0.9w,0.9h}
        _ rightplot
    ]
    
    # main plot
    @series begin
        right_margin --> 0mm
        top_margin --> 0mm
        subplot := 2
        i1, i2
    end
        
    # left line plot
    @series begin
        subplot := 1
        bottom_margin --> 0mm
        seq2, i2
    end
    
    # bottom line plot
    @series begin
        subplot := 3
        left_margin --> 0mm
        i1, seq1
    end
end

What's going wrong with the left subplot?