Hello,
We did few tests and moved your content above and below. After removing main content and created it from stretch it is ok now -> https://prnt.sc/WZjuUjT6PfUx . Also, we didn’t make any changes for Email builder for the last 10update 100% so if you are sure that some issues started after last update please, give us an answer what was you latest version you updated from ?
Regards