"If I bought officers model/compact mags, is this the reason that they will not fit into my full size 1911?"
Yes, if the magazines you bought are for the Officer's ACP length frame they will not seat (catch) in a Government frame. Compair the length of the Wilson's you have to the one's theat came with the gun and do work (don't include the thickness of the base pad, just the metal body). If the Wilson's are shorter you have your explination.
If they aren't shorter, ask yourself why they were for sale "cheap". There might be a reason, like some body screwed with them and they don't work for him anymore either.