Has anyone encountered a dark grey bar that appears over the answer choices upon retaking a quiz?

This happens only on multiple choice questions, with shuffled answers, and upon retaking the quiz. The dark grey bar appears when you hover your mouse over the answer choice selections and actually blocks the text from view. However, when answering the multiple choice question the first time (prior to a retake), the grey bar that appears is much lighter and does not cover the text. No other question types had this issue, and it does not happen unless you select Shuffle Answers. That is the only common denominator.