Where to look for restrictions in wordpress themes?

Question

WordPress

Friends, help me figure it out (perhaps someone has already solved the problem described below), I ask for help.
I'm making a WP site using the Zerif Lite theme.
When this or that “jamb” appeared, while working with it, I even tried to solve the difficulties that arose ... But a bright thought flashed through my head, and with the next glitch, I applied another theme and the glitch in the new topic disappeared. Then I returned Zerif Lite again and the glitch appeared.
I conclude that there are some restrictions in the topic itself, and possibly hidden links ...
Help me figure it out: Where to look for restrictions? How might they even look? Where and what to remove?