The issue is in the Question Q4 itself. The variable Q4 contains more data than needed.
What is Q4. If it is a Equation question it might contain HTML code somewhere, which pollutes the variable Q4.
I my opinion : you must check HTML source of question
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I can confirm that the field of the untrue case does not need to be completed if not necessary.
Issue resolved after checking the HTML source.
It seems that somehow some options/tags were added on the background in the HTML source after pasting from word and changing fonts. Just removing the extra added options/tags resolved the issue.
Couldn't reproduce the issue for potentially filling a bug report.