LR can display two "User Presets" groups in the Presets panel when running in other languages. To reproduce:
1. Start LR in German.
2. Create a preset, putting it in the group "Test Group".
3. Right-click the newly clicked preset and do Verschieben (Move), selecting Benutzer-Presets (User Presets).
4. Observe there are now two groups named Benutzer-Presets:


I observe similar results for Norwegian but not English. (I didn't test the other 13 languages.) Most likely, some code path is testing a group name against the English "User Presets" rather than the translation of "User Presets".
Tested on LR 12.0.1 / Mac OS 12.6.1.