Front axle pulls out of tube
 

Got a replacement CV axle for the passengers side and clicked it into the differential I've got for replacing the old one, just to make sure it would fit. When I tried to pull it out, the axle came out of the tube with it. I didn't pull the axle out all the way, I just seated it back in there. If I spin the CV axle, I can still feel it moving on the inside, if I put my finger in the other side while I'm doing so.

Is this a problem or is it normal?

97 olds bravada, GT4 /3.73 front end, factory ride height