Large table html syntax

Hello xwiki Team,

I’m currently working on a migration from an older wiki system to xwiki.
I create my pages using the REST API.
I have one page which contains a large table with images.

In my API call the whole page is in xwiki/2.1 syntax.
But if I try to edit the page in the xwiki editor the whole page is in html.
Do you have an explanation for that behavior?
I’m currently on the 13.6 version using docker with mariadb on CentOS.

thanks for your help and best regards