SS3, Entry Sensor shows open, but door is closed

It's either the sensor or the location causing it to not send it's updates to the base station.  First thing I would try is swap sensors with another one to see if the issue follows the sensor or the garage door.  If the problem follows the sensor call SS for replacement.  If the new sensor on the door has the same problem, you may have to try moving the base station to help it out.  Some times a couple of feet can make all the difference.

Moved base station a few feet.

Also swapped sensors. with one pretty far away in the other direction.

I had the same problem with my garage exit door - in my case, I had to make the sensor and magnet flush because the door trim was different than my other doors.   I attached a small piece of cardboard to the back of the magnet bracket (to build it out), then screwed everything to the door, it worked.