Safety Drop
Hi Gary.
You'd be surprised at how often I see that. The answer is to refit the safety
as per the thread "Thumb Safety Repair" or get another safety. If yours is machined steel, you shouldn't have a problem. If it's cast, you might.
The WW2 GI Colt that I rebuilt up a few months back had that very same problem. Three or four light strikes fixed it. Give it a try and see if it does the trick. Some are so badly fitted that the only recourse is another safety, though.