2019 php problem

Once again, i suppose the issue is I can work with the code, make changes, etc... yes i get working on php files may look weird in dreamweaver, i've experienced that before...  but lets say, for example, i can work on my homepage... everything looks good and behaves good...  I can move to the php file, a seperate file, and check coding or anything on that file, then when i bounce BACK to the home page or any other subsequent page, the pages show funky from thereon (in dreamweaver only).  Loading them in browser they look like they USED TO before i touched any php file.   It is at that point, yes i can still tinker with the code on the rest of the site but the split or design view is then broken.  I could uninstall and reinstall dreamweaver and bam, it shows properly again, until i try to mess with any php coding in the future... see where the problem is?  i get working with php files could have issues and look funky within dreamweaver and we have had that issue in the past...  but now it carrys over the weirdness onto other pages as well...  so it's like whatever the design/split view is using to process the html gets damaged whenever i load a php page and cannot fix itself even when i close the page.  Closing/restarting the program doesn't fix it either...