But AC measurment is wrong, see attached picture. Has anyone else this seen?
Double check that you're feeding the voltage into the correct inputs. I don't recall which ones are correct for this measurement, so take it as a hint and check the manual.
p.s. I've never tried to measure AC voltage with mine, in fact, it has never occurred to me that it could be used as an AC voltmeter, because, well, what's the point, if I already have a proper DMM for that?
Will maybe try it some time later to see if it's any different from yours.