Probably a stupid question but here goes. I've got some M-series monster cables with Bannana plugs at the ends. When I plug these into the 5-Way posts of my Axiom Speakers they dont insert completely flush they bottom out about a quarter inch too soon. Is this normal? The other end of the cable with identical plugs fits all the way into my receiver. I have the binding posts tightened all the way down are some binding posts just shallower than others?