I suspect that there's a clue in your OP ... "Some of my players are experiencing trouble with some of the monsters. More specifically Ghouls and the Large Variants of the Ancient Dragons."
Since you specifically named "ghouls" and "dragons", I suspect your override folder(s) contain overriding appearances for these, and possibly other critters. If this is the case, your players will either need the same overrides themselves in some cases ... or you'll need to clear your own override folder, just serverside I suspect.
Here's a link to the 1.69 override folder download with just the overrides Bioware added. You can rename your current folder "override1" or something and use this one to test this theory. http://neverwinterva...ide-patch-files