Honey smells sour

Hello
Thank god for this app as we have had a couple of challenges lately being fairly new at all this .
We have had a few really great extractions but one we did sept 2019 has now began to smell awfully sour when we open the jars and tastes awful infact I couldn’t get the taste out of my mouth .
And a couple of jars seemed to have overfilled by itself .
I have heard of honey fermenting but people say it’s still edible but this batch isn’t .
I don’t want to waste it but I’m worried if we give it back to the bees it may cause foul brood or something.
Any suggestions would be greatly appreciated :blush: