Yes, obviously something not quite right. Mine is really light. perhaps it's been knocked at some time and has a very slight bend in it? If all looks straight, I would probably try a little light oil to see if it helps Is there any gunk around the shutter at all?
That's something I would only try with a repair manual in front of me. There is nothing to make a situation worse than not knowing any better. I am not wanting this to go to camera heaven yet.
I've been looking for a repair manual all over. Any links? All I found were sites charging for them. As I am a recent outsourcing victim, that's a game I cannot play.
Get it right in the camera, the first time... My flickr