They may have installed the wrong bushing. It should slide in fairly easily. You might have the trans shop verify the bushing and the yoke are correct/compatible.
there are two different OD of the yokes. the inside and splines are the same but the thickness of the yokes are different. The bushing and seal will be different also. I found out the hard way. I used the smaller OD yoke in a trans set up for the bigger OD yoke.