we've been running our site through html markup checks and they all agree that there is an issue with the header, namely that the fontify-lang tag is not allowed in the header. See here:
Has anyone using the app run into the same issue? What does this tag do?
Solved! Go to the solution
This is an accepted solution.
Hope you are doing well. You can find and remove fontify-lang="de" attribute.
Hope this helps!