Toilet has a rubber flapper that after a flush doesn't always get seated properly. Most times, if there are no solids in the bowl it does this. Twice I've replaced the flush assembly with a new kit. It seems to be okay for a few weeks and then reverts.
When I look in the tank the flapper is almost always off kilter, like it was pulled out too far and moved a bit.
Looking for tips on getting current kit working right before buying yet another replacement.
Edit: Added photos.
Best Answer
If the problem keeps occurring after a new flapper has been installed then you should be sure that:
the chain from the flapper to the handle is not too short as to not allow the flapper to seat fully.
If the flapper continues to sit askew it may be installed wrong. make sure that the two openings on the flapper arms are sitting evenly on the overflow pipes attachment points. It should not bind.
Some flappers have a hollow bulbous cavity that sometimes get air trapped inside. This may prevent the flapper from closing properly. Remove air from cavity.
Some tank cleaners that contain chlorine or other chemicals will degrade the rubber flapper making it brittle and deformed. There are ones resistant to these cleaners.