Multiple Choice Questions not saving answers so question fields show up blank

Hello,

I have an issue with my multiple choice questions. When building out the course I create questions and fill out the answer fields and select the correct answer and save. The course will work just fine at first, but after a couple days the EVEN numbered questions are having the correct answer radio button unselected so the question will not show up anymore.

I have gone in and just re-selected the correct answer, but the same thing happens again a few days later. I have attached a screen shot that shows what happens when the radio button unselects itself. You can see that the answers are missing but the "submit different answer" link which shows the question showed at one point and was answered. Like I said the issue is only on the Even numbered questions. This issue has shown up on almost all my units.

I have already granted access to my site.