Theme not displaying properly

Within the last days the hiero theme changed its entire appearance although I have not done any changes to the code.
I already tried changing to another theme and reinstalling the hiero theme.
However, the changed appearance remained.

It then returned back to its usual appearance again (without me changing any code).

Now, it changed back to the sloppy appearance which looks like the hiero theme has been stripped bare from its core.

I can show you an example post of mine to demonstrate the issue:

https://yourdiamondteacher.com/diamond-color

This certainly does not look like the hiero theme anymore

This is really strange and I really don’t understand why the appearance has suddenly changed.

Does anyone maybe have a clue what to do about it?