The blade is tilting somehow....
If the blade was wobbling the kerf would just be wider. So, it's not the blade or the washers.
Either the carriage is not secured on the trunnions OR the trunnions have a loose bolt OR the table is shifting from feed pressure downward. A Unisaw is a cabinet saw where the table is shifted to align the slots to the blade. Something is loose or worn. Make certain the tilting shaft is "locked" so the trunnions can't shift.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)