Links of Media Randomly Changing by 1 Pixel

I don’t know how it happened, but I am finding that links to images which have the dimensions in the file name are somehow off by one pixel. For example: the path specified for a photo is src=”https://www.stewardshipoflife.org/…/Matt-Dempsey-cc-300×199.…”. The photo file, however, is named Matt-Dempsey-cc-300×200.jpg. The file name in the link is off by 1 pixel. This causes the photo not to display, of course. This problem is random, but the pattern is always the same when it occurs. The dimensions in the file names are off by 1 pixel. This only became obvious after the site was moved from a subdomain to primary domain. The problem did not exist when the site was situated in the subdomain. Everything displayed properly so I believe the file names in the links were correct. Sounds crazy, but I do not know how it happened. It can be fixed by going into each post where the problem occurs and either changing the file name to what it should be or by selecting the photo and choosing to Update the photo using the update button. There are literally hundreds of photos on the site and it will take countless hours to make all the changes manually. My question is, can anyone identify what may have happened and is there a way to globally update all the photos in the site? I do not want to replace the photos, I simply want to Update them.