More Awesome Than You!

I have a fairly new neighborhood with a total of 6 playable Sims. Four of these Sims are at Uni, and all live in a Greek House.  The Greek House was founded by the twin Son and Daughter of my founding couple.  I noticed last night that all four of the YA's have rolled new LTW's.  It's not a problem and they are totally achievable, but I haven't the slightest idea as to how it happened.  I haven't bothered to check the parents back in the base hood, they have each fulfilled 2 or 3 LTW's already, so I don't really care what their current one is.

The last time I looked at the LTW of any of them was right after they started Uni, so I could assign their major to compliment their LTW.  The Greek House founders have just started the 2nd semester of their sophomore year, while the CAS pair I moved in from the dorm haven't yet completed the 1st semester of their freshman year.

I don't have Pescado's Greater LTW Variety hack enabled at this time.

I guess it just boils down to; does anyone know what could cause this mass LTW reassignment?

It's happened to me now and again, but I don't know what causes it either.  I use Squinge's mod that allows any LTW for any aspiration and often they will roll back to the original if they're not saved before their next wants reroll, but that's a different thing altogether.  I've definitely had them reroll spontaneously before using that mod.  The only other thing I can think of is have you changed the aspiration of the Sims in question and if so, are the new LTW's more suited to their former aspiration?  I doubt that's the case, but it's the only other possible cause I can think of. 

It's happened to me too and I've wondered if LTWs re-roll when you install a new EP or something that resets the 'hood.