My iPhone 6 Plus has scratches from my credit cards in my wallet. Has anyone else experienced this problem?

I recently purchased the new iPhone and bought a folding wallet case. On one side there are slots for credit cards and the other holds the phone. I noticed that the credit cards are making an impression in my phone screen. I don't put my phone in my back pocket, always carry it in my front slacks pocket. It does not seem like credit cards should be able to scratch a display. Has anyone else noticed this problem?