Unable to delete facebook comment?

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On my wall, I made a comment that others commented on. The final comment someone made is an ugly one and I want to delete it. When I click the X to remove it, the whole screen scrolls or jumps and the comment is still there. It has been that way for a few days. I have signed out and back in, I have veiwed it from another account and it is visible. I am wondering if it is possible that the user turned my post in as offensive or something, I have never run across this and have successfully deleted another comment on the same thread. His is the only one that will not delete. Anyone have any ideas why?