The track on the sliding glass door should have a weep hole drain hole on each end to drain the water out of the track.
How to fill in track on sliding door.
It is likely that one or both of these weep holes are clogged.
Repeat with the other wheel then angle the bottom of the door out and remove the door.
Work a flat head screwdriver under one of the wheels lift it and angle the door slightly until the wheel clears the track.
Remove the door from the track.
First one shows the screen track and the track where the sliding half of the door sits when it s closed.
Keep a firm grip on both edges of the door while.
Open the door about half way lift it straight up and pull the bottom toward yourself until it is free of the track.
Get a helper to lift the door.
Second one shows the unmoving side of the door and the track where the moving part slides into when opened.
Look for dirt or debris that could be clogging these holes.
In this video i demonstrated how to make tracks for a sliding wooden door and a technique to modify your saw blade.
I m attaching 2 pics.
Feel free to ask me any questions and com.