Had this happen to me again, and I believe it was similar to the first time. I had zoned into the Icy Keep and skinned the yeti. When I right-clicked to Use the skin, I got a pop-up of all my warders as though that hotbar was the popup. The skin was in the fourth row of the first bag. Moving the skin up to the third row or down to the bottom row made the issue go away. The hotbar that appeared was #5. I did not check every free slot in the bag.
I believe this is in the default UI because the first time happened in beta at a point where I was still using the default.
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