350D (XT) kit lens = sloppy mount?

I've noticed recently that with the 18-55 kit lens mounted on my XT the lens is able to move around a little on the mount. It's not HUGE movement, but it is able to move a little bit. It DOES shift a tad when focussing in the mount.

Has anyone else experienced it? Is this a normal thing with the plastic mount of the kit lens? I haven't noticed it with my 50mm f1.8 which also has the plastic mount, and it for sure doesn't do it with my 100-300 with the metal blade. I'm guessing it's a fault with the lens.. but am wondering if anyone else has seen this

I've never seen it on mine.

Is the lens. Actually, my image is shaking in the viewfinder if I touch the lens (the kit lens only).
My advice, don't go for a shooting in the evening, if there is wind.

Mine is as solid as a rock. I love using the kit lens to be honest

my 18-55 shifts just a bit
50/1.8 shifts much less
70-200 f/2.8 shifts a lot

The best mount is the m42 screwmount. Can't shift that

My 18-55 doesn't move in the mount but the focusing ring is about as solid as a badly made jelly.