Theme format damage after change of language or timezone

Hi there!

Hope of help. I have some plugins installed. KanboardCSS, Customizer
Whe I change over a UserProfile the language or the timezone it makes the formatting wrong. Everything is on the left site. So, I think it dosent load the right CSS.
But what is in conjuction from the theme and the language or the timezone. It`s not logical for me.
Is there a way to hide the settings for timezone and language for the users?
Better is, to fix the bug

Greetings barbara

Unfortunately, I cannot verify your issue. I’ve installed both, KanboardCSS and Customizer.
My setup:

Application version: 1.2.38
PHP version: 8.2.20
PHP SAPI: apache2handler
HTTP Client: cURL
OS version: Linux 6.1.0-23-amd64
Database driver: sqlite
Database version: 3.40.1
Browser: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0