Where did you say you were reading the original weight schedule?
The empty weight in the POH, you know the official Cessna handbook that the people at Cessna wrote is 1101 lbs. Ours has had some avionic changes that have reduced the weight to 1080.3 lbs. I've even taken some photos of the relevant pages/documents but I've a feeling even putting those up will make no difference
As Cessna obviously did not weight your aircraft 3 years ago then.......
So you should now suspect that either your airframe has been fitted with a helium flooding system, or the W&B might be a tad optimistic! Certainly the one I had a share in weighed more than 1250lb. But then it did have a Nav/com AND DME