URL Redirects dont work apache issue i think(?)

Im currently coding a website, and to navigate the pages i created a test button which simply has a url redirect to the next page (rather than registering a new account every time) just for the purpose of seeing whats going on and quickly navigating to a page im working on. However, I havent changed this code and it was working fine a few days ago, but now using the "test button" doesnt do anything. Even entering the urls i want to redirect to manually into the browser does not load those pages. Some pages do work, but any page past my "signup" page does not. Ive tried putting a generic url into the button such as "www.google.com" and when pressing the button it successfully redirects me, so i doubt its a coding issue. Im really unsure, any help appreciated. Im not really sure how i can demonstrate this through images but if it helps, I use Xampp with apache to run the website locally hosted, I also have my php files placed within the htdocs folder so that they arent misplaced either. anything further, please ask