All is vague here, because you provided very little detail such as the product, or the size of the bags - but assuming you used 80 lb bags of Quickcrete, or a similar product, that was at least 1 quart too much water per the linked page. If you used smaller bags, such as the 60, 50 or 40 lb sizes they also sell, it's worse.
If the product was old and the bags had partly hardened, there's a further problem available (concrete mix that has set in the bag won't set again, even if you break it up so it vaguely resembles a powder.)
I would agree with the comment that that's not much of an anchor for a sail of any size, so it might just make battering rams for the wind to flail about with....