Originally Posted by Layback_
Each buff size is set to 20x20 with 2 pixels spacing between two buffs while the buffs frame is set to the size of 100x100. So, the fifth buff will exceed by 8 pixels.
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20px * 5 + 2px * 4 = 108px
Once again, to understand why you have this issue, please, read oUF code.
That's how number of columns (auras per row) is calculated, it rounds the value, so in your case floor(100 / 22 + 0.5) = 5.