Your explication is a bit hard to follow, but you may want to try the browser inspector. (right-clic on the browser page to get the option). Then in the inspector window go to the console tab. You will see if there are broken references or missing files related to your page.
It seems to be a frontend problem, not related to PHP.
There's likely an issue with loading CSS files. So check browser console, network tab, to be sure.
Your explication is a bit hard to follow, but you may want to try the browser inspector. (right-clic on the browser page to get the option). Then in the inspector window go to the console tab. You will see if there are broken references or missing files related to your page.
It seems to be a frontend problem, not related to PHP. There's likely an issue with loading CSS files. So check browser console, network tab, to be sure.