Most are tossed due to inaccurate information, i.e. no valid license number, non-existent address, or other evidence of fraud with the items required in the provisional ballots!
Occasionally, such voters leave before actually voting when they realize they cannot actually provide proof of accuracy as to their registration.
Yet another reason Kansas does not allow same day voting as registering, plus our cutoff for advance balloting gives us time to check actual registration.
I or we have found that advance voting has been yet another way to cheat because all one has to do is check the "yes" box to "prove" you are A citizens!
LOVE the provisional ballots!