Hi Nico,
It seems that the WordPress Unordered List Block is nested under another List Block. See: https://share.getcloudapp.com/kpu8olyq
This is the reason why it’s indented too far. The indentation is doubled.
Can you check the structure of the List by opening the List View in the Editor as such?: https://share.getcloudapp.com/04uQ1vr7
Check if your list is not nested.
Can you also try recreating the WP List Block to compare?
Kindly let us know how it goes.