When not being used, the toilet continuously flushes over time. It's like the toilet drains the water low over time to make it flush. I have changed out the flapper and still have the same problem. I did notice the tank is not level, could that have something to do with it?

When not being used, the toilet continuously flushes over time. It's like the toilet drains the water low over time to make it flush. I have changed out the flapper and still have the same problem. I did notice the tank is not level, could that have something to do with it?
... the tank is draining into the bowl or that the bowl is actually discharging down the drain all the time?

The tank is draining into the bowl.

the tank is draining into the bowl.
... making a tight connection? Anyway to hold it tight against the rim to make sure it is not yet the problem?

When not being used, the toilet continuously flushes over time. It's like the toilet drains the water low over time to make it flush. I have changed out the flapper and still have the same problem. I did notice the tank is not level, could that have something to do with it?
, Sounds like your flapper linkage needs adjusting.
With the flapper seated the linkage wants to have 1/4" of play. Too much play and the flapper doesn't get pulled back enough giving you a short flush. Too tight and it lets water seep past the flapper. I adjust the chain by the link and if it needs fine tuning, I bend the flush lever rod a bit untill I have the desired play in the linkage. One more thing about a flapper. you will see where the old flapper hooks onto the base of the white overflow tube. On a older type with no hooks the flapper has a ring that slips down over the overflow tube to the seat. If your tank has hooks, take a sharp knife or scissors and cut the neoprene ring off on the marks provided and hook the flapper on the hooks. Leaving the ring on will interfere with the flush. The water level in your tank should be 3/8 to 1/2" below the top of the overflow tube when the tank's filled. Let us know how you make out. Cheers Tom