Problem with connecting to WordPress app

Hello,

I have 2 pages on same hosting:

https://www.zacnicestovat.cz and https://www.rogner.cz

Both I have in WordPress app. Everythin in this app with https://www.zacnicestovat.cz is ok, but with https://www.rogner.cz I have this problem – I see only statistics but not posts, pages, media,…
When I sync manually, there is error: “The Jetpack site is inaccessible or returned an error: transport error – HTTP status code was not 200 (500) [-32300]”

Thank you for your help,

Roman