How to solve the problem with the redirect that leads to the main site?

Question

WordPress

Good afternoon!
The problem is this: we installed a new layout, fixed some bugs, then the programmer did something that now redirects new users from the internal page to the main one. Redirecting once doesn't redirect again. Presumably, the redirect is done using php, when returning to the main page, ?log=1&q is added to the address bar.
How can this be solved and removed this bug? Yes, you say - ask the programmer, but he does not answer, and time goes by and thousands of people cannot watch and see the content they are interested in, redirects them to the main page!
other programmers also say that there are a lot of files, and where to look - XZ)

Answer 1

Download any IDE like phpshtorm and look in the theme files or check plugins.