Sudden negative camber.
 

I just installed a camber kit that I bought from SpeedyBnz for my rear last weekend.

It turned out great. I no longer had the negative camber that we get when we lower our cars.
I was also happy that I would not have to deal with early tire replacements as my inner side of the tires wears out much faster.

My problem started yesturday.
I noticed that the rear passenger side was no longer straight.
It was starting to go negative again.
I thought it was strange and thought maybe the car was just settling in.
Was planning on removing the tire and taking a look this weekend to see if maybe something was loose or I may just need to re-adjust.
However, today when I drove to work, I noticed that the rear was really bouncy coming from the same rear side.

When I parked and looked, the negative camber was even more negative than the day before.

So my questions is, is this problem related to:
1 - the new camber kit,
2 - possible need of a new strut
3 - possible need for new springs
4 - both 2&3
5 - all of the above?
6 - something else that I may not have thought of?

Anyone had similar experience with bouncy rear or sudden negative camber?

Car model?

96 W210, 175K miles