I am able to reproduce this, however it doesnt seem to actually occur every time for me, maybe half of the time, works even if you arent owner of the lock.

 

I am also able to reproduce this while left clicking (may aswell add that in here).

 

I have two wooden doors in my shop that are also acting in this strange manner.

 

I agree, It happening to my oak doors too... I have updated to 1.8

Update: And, 1.7.10 is having the same issue.

 

I'm on 1.7.10 and am having the same issue with both locked wooden and iron doors.

 

Also having this same issue, I am on 1.7.10 at the moment and have tried removing and replacing doors but remains the same

 

This could be a result of the protocol hack Andrew launched recently, then again, I may be spouting absolute nonsense.

 

This is happening to me aswell.

 

I already posted this to a different thread, but another screenie:

 

It's a bug with LWC and 1.8
source: www.spigotmc.org/threads/1-8-protocol-doors-glitching.28572/

 

Its a good thing I have 1.7.2 Nooo bugs :D

 

Here 2