Interesting... I can see it fine -- and haven't noticed anyone else's a gibberish either, though sometimes it gets cut-off if there are a lot of items in the signature area.
Are you on a mobile device? On my cell, the signatures do not appear at all. On my tablet, it seems to follow the cellphone format (no signature) when I'm viewing in "portrait" style but as browser format (with signatures) when I'm viewing in "landscape" style. I'll have to look more closely at how readable those signatures appear next time I'm on the tablet.