Hi Skandha,
I have just tried deactivating all plugins and the problem is still there.
Also wanted to let you know that setting “Excerpt / More Tag Settings” to “0” causes a “Fatal Error” on the website.
I have been reading other theme message boards and have noted a problem with customising among several themes since the WordPress upgrade to 5.5. I have been having other problems with customising Catch Flames Pro, for example some colour customisations haven’t worked and I’ve had to overwrite with custom CSS. Interesting that some work and others don’t.
Kind regards,
Lorraine