Game deleting my barriers

I deleted a null barrier today on a monkey island - just a portion of it.which I replaced with electric fencing to stop a baby getting out there; only to find the null barrier around my flamingos disappeared completely. Everything - just gone.. I was nowhere near their enclosure - right over the other side of the zoo so how did that happen? I had to click the 'undo' button at the bottom to get it all back. I had made the barrier with construction items and put a null barrier around it - it had worked very well since going in and I hadn't had a single escape there until today.. when it all vanished.. even the construction items I had used.

Any reason why deleting a null barrier in one part of a zoo should cause a problem somewhere else? Anyone else had this problem?
Also, at the same time I adjusted a barrier on the same monkey island and suddenly game is telling me the door is the wrong way round eventhough I didn't touch the staff door at all! The keeper is going in and out as he always has so why is it telling me the door is wrong?

Any ideas?
 
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