Hey ArguZ,
Glad to see you're checking out VSig! I see this issue you're talking about – that's very strange. It looks like it's happening because that field has a range (you can see it in the bottom right) when it's not supposed to. So when you enter text it thinks it's "out of range" and defaults to what it was before, which is "text". It should be an easy fix but I won't get to it until next week.
Thanks for letting us know,
David
