Help Phone always hangs up after receiving call

I've searched the forums and can't find anyone else with this exact problem.

If my phone is locked, and I receive a call, I have to swipe two different screens to answer the call (one says "incoming call with the number and has a swipe button in the bottom middle and the other is the traditional android swipe screen with the red and green answer or ignore options). Once I do that, I connect to the call for somewhere between 1-5 second, and then the call will always hang up.

I've checked my settings and apps to make sure that I don't have two different lock screens enabled, but nothing seems amiss.

Can anyone help? This is driving me totally crazy, and getting pretty embarrassing, too.

I am on Verizon, running Android 4.4.2, not rooted. I'm using Nova as my launcher.