Its off the track somewhere. Needs to be put back on track. Its the right side door in the picture that isnt on the track. The door has rollers on the top and those rollers sit in the track. Shut the left one all the way, and see if you can lift the right side up on to the track. It can take several trys, to get it where it should go. Move the door in a bit, and try again, if its not working. Pocket doors can be difficult when they go off track. I have two pocket doors left here out of several, and once every couple of months, one of them goes off the track. I dislike pocket doors, a lot.

They are mishung. I'd look at how they hang. There's probably a roller or something at the top.

"and once every couple of months, one of them goes off the track. I dislike pocket doors, a lot."

And quite honestly the only thing worse than a pocket door is a double pocket door. Two issues waiting to happen.

Narrow pocket doors always go off the track because they are too light, when you push them closed you inadvertently push them up and the inner wheel pops off the track. Switching to an I beam style track would help, I bet these doors are the 70s 80s style with a single wheel. Or a single hinged door.

I wrote an article on pocket door restoration nearly 30 years ago: https://books.google.com/books?id=v7O8ndnxWsUC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false