i have created (long time ago) a participation form id=1019693.
In today’s users data, we received non-readable characters. Like if the system translates the Greek characters to html unicode, for example the A was @ampAlpha and so on. This incident happened in 2 separate answers, id 770 and 771. For 771 i did an edit and corrected the data myself. For the 1st one i’m sending you a screenshot.
This looks like some kind of encoding problem (HTML showing instead of the special characters). I think you may need to contact SurveyGizmo directly to have them investigate (if you have not already).
You can send them a ticket at firstname.lastname@example.org or try live chat.