That's weird. I have a 8# Danforth style and it hooks up and holds better than any anchor I've used. I have a Delta anchor in the bow and it doesn't work near as well.

I'm assuming that you have plenty of chain and the anchor is sized for your boat or 1 size higher? Mine is an 8# with 15' of chain and it worked great on my 20'er. I now use it as a perch fishing stern anchor and it always sets and stays.

That being said I have heard good things about Mantus anchors. There's a contest over on The hull Truth to win one. I won a percentage off in their last contest but I wasn't in the market so I gave my code away.