If they are working correctly the problem might be because of the safety sensors.
One remote opens both garage doors.
This is not a common problem at all but it could happen.
Remove the bell wire from the single button control station s terminals and operate the garage door opener from the remotes.
Then within 30 seconds hold the button on your remote for three seconds or until garage door opener s lights flash or the led light on your opener blinks.
The only thing i can think of is that the handheld remote used to program the explorer if it is a 3 button remote has to be shorting out inside.
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Since it can operate up to 3 doors with the 3 buttons somehow it is learning both doors and when you push one button the remote thinks you are pushing two.
If this solves the problem then the control station is faulty or there is a short circuit in the wire.
This unit is called the liftmaster 850lm universal gate and garage door opener receiver and is available for right around 40 dollars and will solve your garage door opening issues.
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The garage door remote won t work but the wall switch does check the batteries and electrical connections in the remote to make sure they are working correctly.
Buy products such as chamberlain klik3u bk2 black universal garage door remote two button at walmart and save.
As most garage door remotes work only about 20 feet from the opener this unit will make it so you can open your garage from up to 100 yards away.
Shop for universal garage door opener remotes in garage door opener remotes keypads.
To reprogram your garage door remote locate then press your opener s learn button.
Some garage doors have infrared sensors that shoot an invisible beam across the door.
Disconnect the control station.
When your liftmaster garage door opener opens and closes by itself here are the troubleshooting tips you need to follow.