Module settings sometimes shows a red error

[Zaword]

Hello, sorry to bother you with another Issue
It seems that sometimes the Module settings shows an error related to the "Scroll" setting.

Moreover, one option of the "Button Location" setting have a weird name/description.

One more thing: if the Button Location is set as default (Player list) I cannot find the button at all! May it depend on the dark theme core settings of foundry?