That’s because the tick count you set isn’t divisible by your range. If it’s dynamic, then you need to bind the tick count and calculate the number of ticks so that it gives round tick numbers.
E.g. if you have -150 to 150 and want it to increment by 50, 150- -150 = 300, 300/50 = 6. You have to add 1 to get 7 ticks.
It’s not as nice as just setting it to Auto…