Watcher's Keep, The Vigil Knights acting strange Options

[Aegor]

Well I took a little trip to the Watcher's Keep (I'm still low leveled but I wanted to get the Firetooth crossbow) and I'm having some really strange reactions from those false Helm guardians. As soon as I enter their visual range they target my protagonist with Hold Spells (?). They are still neutral after that and I can talk to them normally and start the quest once the hold wears off (or I save vs spell). So I talk to them, get transported up the stairway and then they do it again, again Hold spell on my PC. Any idea why?