EXIF data on K5

This may have come up before so apologies if it has. I post images on here and more often than not the EXIF data shows I am in shutter priority. I ususally shoot in aperture priority and dont recall shooting many shots in SP. Am I just being dense or is something not right?

It's a problem with the forum software I gather

It's an old problem on the forum...

Thanks for clearing that up.