This can also happen if you have recurved tips or lots of reflex combined with a low brace height and a stretchy Dacron tillering string. If that is the case. Try raising the brace height and see if that helps.

Did you floor tiller it to get the limbs bending? Do you have it strung or are you using a tillering string with the leather cups? A video would be helpful, Robyn.

The bow was floor tillered. I double checked for limb twist - one side of a limb may have been thicker than the other but I think shorting my tillering string (Dacron) has fixed the problem for now. (The bowyers knot was slipping). Thanks for the suggestions.

This bow has a couple of knots in both limbs  kinda looks like a roller coaster but not that extreme. It has been giving me some fits so I have been taking it real slow.

When tillering limbs with knots do you leave the limb thick (back to belly) at the knot creating a stiff spot or maintain an even taper from fade to limb tip?

Roy - I wish I could make a video but I do not have a phone or a camera with that feature.
 
Thanks again for the advice. I'm still learning everyday.