Is it only onscreen or on the form printout?
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What's happening is the Wingdings font that is used for the checkboxes is getting replaced by another font, and the corresponding character in that font is actually a lower-case letter q (which looks like a backward p).
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If it's only happening on the printout, you go into Configure>Preferences>Print Options and check "Force print true type as graphics" and click Ok. That will avoid the font selection altogether when printing the form.
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If it's happening onscreen, it means you have some alternate version of Wingdings installed. If you didn’t have a version of Wingdings installed, the program would give you an error message on opening that you need that font. But if you have Wingdings 2 installed, the program would probably just launch, even though Wingdings 2 isn't going to cut it. You can either download the Wingdings font online or email CEB technical support (tech_support@ceb.ucla.edu) and we can send you the fonts to copy/paste into your, (under Start>Computer) C:\Windows\Fonts folder, and reboot the computer.

Then, see if you still have the strange character in place of the check boxes.