How Did I Get Raided?

[oparsenal]

So I logged off last night, and I was inside my locked structure. I logged in today to find that I had been raided & killed. Here's the thing: I have stone walls around my base (two walls high to prevent Megalocerous leaps) with a wooden Dino gate, my structure is almost all stone, I have no windows, I do have a ceiling, and all my doors are reinforced.

I was killed, along with my all my tribemates, and all our tames. Everything we had was taken. Nothing was destroyed except our bed and storage containers, and all our locked doors were left wide open.

How the good hell did the Raiders gain access? I know mesopitheci can unlock doors, bUT I was under the impression that they could only unlock thatch and wood doors, and they could not unlock gates.

How did they get to us?