List block breaks gutenberg

Thanks for this great theme.

Situation:
When writing a post
Add a list block
Result:
the list block is completely on the left of the page
Expected Result
The list block stays in the Gutenberg Blocks column

Example
https://www.fxparlant.net/wp-content/uploads/2021/03/screen_20210304_105640.png

Catch Box Version: 4.8.9 firefox 86.0 (64 bits) (windows 10)
Regards
François