Roper dishwasher leaks from under door

the water leaks from bottom of door . when i open the door after its has filled the water is over the heater ring about 1" and up on the bottom of the float bout half way, i can lift float but it drops to bottom again what parts do i need . and how to replace them thank you.

also find if i let it fill then open the door and dip out some of the water it wont leek while cycling throw wash. so guess it is simply overfilling but what is causing that ??? :confused:

huanina, thanks