Routine with bug for getting array element by probability

DropLibrary.cs

private DropConfig SelectRandomItem(int level){
            float totalChance = GetTotalChance(level);
            float randomRoll = Random.Range(0, totalChance);
            float chanceTotal = 0;
            foreach(DropConfig drop in potentialDrops){
                chanceTotal += GetByLevel(drop.relativeChance, level);
                if(chanceTotal > randomRoll) return drop;
            }

            return null;
        }