Hello @ldegraaf,
It appears that you and I are having the exact same issue, within reasonable comparison.
Given PPK results, my photo positions are also all over the place relative to the .pos path, in much the same way as in your second image.
Additionally, I too am receiving more events than photos. Normally I blame this on excessive ground speed and thus pushing the limits of my A7R III, which responds by overrunning its buffer and failing to save captures (but still managing to send a pulse mid-exposure, what a pain).
Sorry I don’t have any actual help for you, but hopefully having two users with similar issues will garner more feedback - and perhaps a solution.