The site says it updates everynight, but my signature has been reflecting the same data for sometime now, still showing me as Lvl 30, i am 2 bars from being 36.

Hmm...would you mind linking the sig in question?

I know I got my 2nd exalted rep Saturday, and it still hasn't changed.

I see 2 Exalted Reps showing on yours. Try just pressing the Reload button. Remember that the image location doesn't change, which means that your browser is probably caching the result.