doors opening at same time

still getting through the mapping tutorials and ive encountered a problem.
i follow his instructions in the video to shift drag clone the door and trigger (yes, groups/object was selected" and then use the replace menu. after i do that, the first door trigger also activates the second one. what do

 

ive gotten them to work by manually fixing them, but why didnt the replace tool work?

 

Them opening at the same time was caused by them sharing a name. Just give each door a unique name (such as door_001 and door_002) and this problem won't happen.

 

will do, thank you