Hi @miekwave
That’s definitely odd behavior.
Can you send me the site Read-Only links please?
Can you please take a screenshot of your Console and send it to me when you see that migration error? Chrome DevTools - Chrome Developers
Could you also please let me know what browser version you’re using by sending me your information from this page?
There should be a small share link when you visit the page which you can send to me.
Thanks in advance!