Pressure plates opening multiple doors - what am I doing wrong here?

You have multiple doors, but you use "Trigger Once" which is causing you conflicts as this trigger doesn't run per instance. If you want to run it per instance you can replace the following:

"Trigger once" -----------> by -----> is Animation Playing "Closed"

This will make it run per instance.

You can also remove the "For each" and all the other extra checks as they run every tick unnecessarily and do all your logic under the

Player is overlapping door:

----> door_plate is not Active

To skip all the subevents when the (Player is not operating door & door_plate is Active)

Also, you will have everything more organised in one event.

Here is one example:

https://www.dropbox.com/scl/fi/s7yw609wcrqc9w5eu7ph1/Multiple-Doors-Fix.c3p?rlkey=lpmf1k0mx7u0zp68s2d6tynr1&dl=0