So there are always seven numbers on the y-axis, the math calculates what numbers to show based on the data it’s given. The reason it looked nice above is because it’s the numbers from 0-6 so it was exactly 7 numbers. It seems like now, the max number is 5 in your data so it’s trying to get 7 numbers from 0 to 5 so that it can fit the bars. This is why there are decimal numbers.