The top button layout is corrupt (see pic)

No other addon is loaded. After changing the german localisation to shortwer wording it looks ok

Can you provide the shorter wording so I can change the German translation? Or add it yourself at https://www.curseforge.com/wow/addons/collectionator/localization/languages/94/phrases

The translation itself is good. There are no shorter german words for it.
Just the position of the buttons is not optimal.
Guess it wil happen to other languages also. Maybee move the left 5 Buttons to a second row

I've repositioned the buttons:

You'll find the new positions in the latest alpha, and they'll be in a normal release in the next few days.