I finally purchased my first enlarger today!!! It's a Beseler 23 C II in almost perfect condition. Now that it's home and I'm playing with it, I noticed I have the same problem as the OP
But after doing a search and seeing that it sounds like a common condition I now feel like it's nothing to worry about and I'm not freaking out
I picked up the enlarger with a 50mm lens and neg. holder, a Time-O-Lite M-59, a 5"x7" Premier safe-light, and a canister style one. I paid $125. I feel I got a nice deal, and I'm itching to get the few other things needed to get started.