@Kumirei is correct… Max height is the max number of reviews (note the “reviews” in parentheses). But it uses a formula to round up to a number that’s going to give you some nice even graph tics.
If you set it to 100 instead of 118, you’ll get “0, 20, 40, 60, 80, 100”.
Here’s how it works:
The allowable vertical scale labels are:
1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000…
It’s looking for the lowest scale value (from that set) that will equal or exceed your “Max Graph Height (reviews)” in 5 tics or less (6 if you count the zero).
So, using your 118 as an example:
In your case, you had:
* 118 / 1 = 118 <-- 118 tics if each tic is 1 review
* 118 / 2 = 59 <-- 59 tics if each tic is 2 reviews
* 118 / 5 = 23.6 .
* 118 / 10 = 11.8 .
* 118 / 20 = 5.9 .
* 118 / 50 = 2.36 <-- 2.36 tics if each tic is 50 reviews.
So, it rounds 2.36 up to 3, and you end up with 3 increments of 50:
- 0, 50, 100, 150
If you use “Max Graph Height (reviews)” = 100:
* 100 / 1 = 100
* 100 / 2 = 50
...
* 100 / 20 = 5 <-- this is less than or equal to 5
So you get 5 increments of 20:
- 0, 20, 40, 60, 80, 100