The small pop-up picker for modified emotes renders underneath the main emote picker boundary, causing it to be cut off on certain emotes on the far left or right sides of the picker. Depending on which emote I'm looking at, I will either see all, some, or one of the available modified versions. This makes a fair number of these emotes unusable as I have no way of selecting them.

https://i.imgur.com/RpfGF3r.png is an example (from channel The_Betus). The picker for the first emote cuts off two modified versions, the second cuts off one version, and the last shows all 4 versions available. All three of those emotes were in the first column of the grid - emotes in the last column are similarly affected.