If other Night Elf Death Knights aren’t experiencing the same issue, it is possible it is specific to you, Nonoring. It would be unusual it was though, as I don’t think I’ve ever seen an issue that was unique to a single character. since you said you tried on a different PC we can probably rule out an addon/corrupted file issue (unless you have something on both PC’s that could cause it, but that seems unlikely).
I would definitely report it as a bug, either in the Bug Report forum or via the Support menu in-game. It is possible that it is impacting other Night Elf Death Knights, just not all of them, or all of the time. It would help to put it on QA’s radar if it isn’t already.