Hackers Help: PAX Wardrobe Sliding Doors – Added a 3rd closet and now the rails don’t line up

I purchased a Pax Wardrobe unit (2 frames, each: 39 3/8” wide and 93 1/8” H. The total length is 78 3/4″)

I purchased a third unit: 39 3/8” wide and 93 1/8” H and the door and rails to accommodate it.

I cut the sliding door rails to fit the third unit, but the seam between the connected rails is sticking badly and causing the doors to come off the rails. They don’t roll smoothly at all, as the they do in the first two units.

Can you suggest how to correct this problem with a specialized connection piece, or if it is available, a length of rail (top and bottom) that would extend the complete length of the three units, which is: 117 3/4”.

I don’t know the exact name for the type of rails Ikea uses, so I’m not sure what to ask for, or if they come in the 117 3/4’ length.

PAX wardrobe sliding doors

PAX wardrobe sliding doors problem

PAX wardrobe sliding doors

PAX wardrobe sliding doors

PAX wardrobe sliding doors

~ Ron Marsh