I was using an experimental version of 2.8 which I had downloaded a month ago and I thought that maybe that could be the reason for the minor discrepancies so I deleted it and downloaded the official version that was released; but I am still having the same issue. At this point I don’t know what else to do…
Edit: I decided to re-do the entire UV texture stuff from the beginning with the official version instead of trying to work with what I already had from the previous version; and it now seems to be working… I sure would love to know what the trouble was.