Damage to the door itself.
Sliding patio door track fills with water.
If the sliding glass door is placed directly on a pre existing concrete slab with no recessed area in which the door track can lay water can penetrate the home s interior flooring through the bottom of the threshold if there is a breach in old caulking.
The weep holes seem present and unblocked.
This is a three panel horizontal sliding window.
Have a reputable sliding door contractor remove the door if it has not been damaged build a new frame and reinstall the door.
Any thoughts on how to fix this.
Look for dirt or debris that could be clogging these holes.
I am adding a photo of the window tracks.
There s a trio of aligned holes on the track rails.
If a frame is crooked water can leak into the gaps between door and frame.
Water can seep through even the smallest cracks.
Water collects on both sides of the track where the sliding part of the door sits and where it slides.
The water seems to be filling the window tracks then entering.
Sliding door sliding patio doors are the solution sliding panel travels on a hardened stainless steel track cover for ek366 glass options along with argon or krypton gas fills are options k366 that you will want to discuss with your window representative.
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.
To slide the heavy doors along the metal frames the doors use metal or plastic rollers.
These holes are normally in the outside corners of the tracks.
Check to see which door moves and which one is the stationary.