Many web forms filter out strings that may be used in injection attacks - though most modern systems do it silently at the back end. MyKi's feedback form not only filters at the front end, but somehow they seem to think a plus symbol (as in 24+ hours) looks a bit dangerous!

Honestly, you've gotta wonder what decade they coded this site in. The feedback form loads in a javascript spawned pop-up window and has some form fields without labels. Even their Accessibility page fails Accessibility tests!