Thanks very much, everyone. I’ll definitely contact the harp store.
I’ve been using the Carmac knot with an anchor (a bit of thick nylon string). I did use the bunny ear before, but I find the Carmac much easier. If you think that could make a difference, I could try it again with the regular knot. Either way, I’ll contact the store, as much as I don’t want to lug the harp there.