Hi each time I put bike on centre stand it seems to rolll over to much not allowing back wheel to come of ground, seems to go to far. Seems to go past point of maximum height
If it is going past vertical, too far, the footpedal will actually touch the ground. Is that happening? If so you are correct its too much. The footpedal should not be touching the ground with the stand in full parked position.
The stand has two substantial contact points on itself. Unlikely they are a problem. But the frame cross tube they contact, and which then acts as the "stop" is subject to collapse if it has been abused ie: overloaded bike on the centerstand, people sitting on the bike while on the stand etc. Ordinarily the frame cross tube can handle it. But if its rusted from the inside or just otherwise a fluke, it can collapse and let the stand go to far.
This is a dangerous condition as it can let go and the bike can fall pinning you or worse. Hopefully I'm off base and its something else. Possibly in the pivot tube.
Good luck, let us know.