I have the same problem. Took it to two repair shops. Said it was a bent blade. Changed blade. Still does it. I talked to MTD, Troybilt. They claim no way it should be lower on left. But it is.
Front to back adjustment is good. Left side of deck is 1/2 inch higher than right side. Need to level but no one knows how. No side to side adjustment for the 30 inch mower