The door in My Overlander was within the tub. The door would not come out of the tub because the bottom of the door was below the rim of the tub.
Has your door been adjusted since original installation?
I removed my door because it was to short to keep the water from getting all over the bathroom.
I think that the door was intended for sitting in the tub and using the telphone head as a sprayer.
We like the shower curtain and it looks very good but I admit that it is not original.
Smily