Ok so let's tie this thread up before Kyle has a stroke...
With the power seat memory option, the drivers seat adjusts forward and backward automatically to make it easier to get in/out.
So, for example:
You're really short so you keep the seat forward to drive. You turn off the car and the seat moves back so you can get out. You get back in the car, insert your key and the seat moves forward to your preset position so you don't have to.
Get under your seat and check the wiring going to your power seat. Look for broken or twisted wires. If you don't find anything there, check the wire boot in your door for broken wires coming from your memory buttons. I'm not sure where the memory controller is located, but you can try tracing wires back to it and replacing it. You can also try replacing the switch itself. They are about $60 on RockAuto.com.
For the record, Kyle IS correct. This is the Modified Explorer Sub-Forum. Even though you have a "modified" Explorer, you are having a "stock" issue. This forum is for discussing specific modifications, and issues with them. Not modified Explorers in general. We have several sub-forums for specific issues, to help users find information more efficiently. There are several "Power Seat Issues" threads in the stock section. Be sure to use the Search function to try and solve your problem before creating a new thread next time. I would also suggest taking a few hours to explore the entire site, to help you out in the future.