I had the same problem at my place. Didn't bother to check the table because it was in the middle of the house, not near the foundation which has settled. After putting the water in, I noticed that it wasn't level. Luckily I have a full wood shop and garage available to me so I smily jacked up the high end of the table and trimmed down the legs a touch, then lowered it, checked with a level, the jacked again and sanded until it was level. Of course I could have shimmed the low legs but the table is there for the long run, and isn't worth anything for resale, so adjusting the table looks better in my opinion.