Possible solution:
When all of the possible door blocks are inserted on top of each other there
are areas where they overlap and if the door you wish to remain is selected in
one of these overlapping areas it is possible to select the wrong door. To avoid
doing this select the door in an area where they do not overlap. Generally
speaking, if you select the door itself and not the swing you will avoid the
possibility of getting the wrong door (with the pocket doors it is generally
best to select the portion of the door inside the wall).

In the image above the areas that are shown green are good areas to select
the doors. Areas shown in red are where the doors overlap and if selected there
present a good chance of getting the wrong door.
Double doors have similar overlap areas and the same general rules apply.
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