What I have:
1 item with +1 to skill #2
1 item with +1 to skill #4
What I see when logged in to the game (or taken off/on items) and open skills-panel (S):
skill #1: level 18
skill #2: level 19, 1 unspent point
skill #3: level 18
skill #4: level 19, 1 unspent point
skill #5: level 18
What I do:
spend 1 point to skill #2
What happens next:
all my 5 skills become level 18
What I have as result:
skill #1: level 18
skill #2: level 18, but 19 points invested if manually calculate node by node
skill #3: level 18
skill #4: level 18, so my Item with +1 for skill #4 does nothing
skill #5: level 18
It is fixed after teleport to another location, so then I can also spent 1 point to skill #4, but still see all my skills as level 18.
Then teleport once again and see all my skills with correct levels (18, 19, 18, 19, 18).
Also there is some strange behavior related to this things during skills level-up.