I just went to allocate some skill points and found a surprise waiting for me:
I had previously allocated two points in Mind Warden, but now it has 3 points allocated (even though the maximum is 2). It also looks like I got this point “for free” - I have 1 more total allocated points in this tree than I should.
I noticed this the first time I opened the skill window after a relog - possibly related to this similar bug with passive points?