I've returned to Valhalla to finish off the remaining content but I've gone back to my old save in Siege of Paris first and have continued from there now that the game-breaking Majesty in the Dark is fixed (specifically because I had more skill points at that point from clearing the map, mastery challenges etc)
Anyway, I've noticed something really strange the last two times I've levelled up. I get awarded 2 skill points and when I acquire one skill it consumes both of them. I know what you're thinking and before you explain away - I get that if the skill point you're trying to acquire has a prerequisite skill it will buy both of them but in my case the previous skill has already been obtained. Has this been reported before and is there a solution?!