How to fix Canon EF-S lens focusing problem

I started to notice that my CANON EF-S 18-135mm lens didn’t focus correctly, especially when trying to focus far away with the lens zoomed between 80mm and 135mm. AF just couldn’t focus at all and on MF mode it was also impossible. Focusing a near object also produced unfocused areas all around the focusing point. When I removed my UV and polarizer filters I found out that the front lens was not placed correctly. I have no idea how it got out of place because it was protected by the filters, so let’s “focu