I have been working on this particular site for months and just yesterday, the CSS cant be updated or it takes too long (2-3 hours). Im not sure on which area of the site was change- if its on the server settings, FTP, or WordPress configs.
Even if I deleted the CSS file via FTP, It still can be seen if I checked it in the browser and when i checked the file again via FileZilla ftp, turns out it was successfully deleted totally different from what the browsers showed me.
I noticed a w3 total cache plugin installed, and I deactivated it but still the caching problems occurs. I tried talking to the server's web-master but they said there were no changes in the server settings in the last few weeks. Also the same problems goes with the images.
I got to solve this problem asap to continue my work. Any help would do. thank you.