I have glued them before using super glue or goat tuff. Just a dot on each knot from knot to bowstring will suffice.

My theory is that when the loop is first tied, it isn't clamped hard enough when the knot is settled. I use a pair of needle nose pliers after the loop is initially tied and stick it between the loop and string and then open the pliers hard to settle it in. I believe someone makes a tool for this now as well for like $20 or so.