[Plugin: Gwolle-GB] Admin posts showing wrong

Just noticed several problems when trying to post an admin post using the plugin frontend.
a) It marks my admin posts as spam and won’t accept them when I tick the ‘checked’ box and save, I have to return to the post and do it again to publish it. Even then it remains marked as spam (isn’t it rather unlikely that admins would be posting spam in their own guestbook using the frontend?)

b) On the wall it only shows my admin username in bold and bright, the actual message isn’t visible at all as it’s written using a white font on a white background (my theme background is black but the admin posts apparently get published on white).
My admin username is not ‘admin’ for a reason and showing it to the whole world as the sender of an admin post kinda spoils the whole point of using something else rather than admin. I have set my public username as admin in the wp settings but apparently this plugin ignores that. Also,

c) the dimensions of the admin post box seem to be wrong, the white border gets cut off on the right side of the page even in a full width template.

As it is, the admin post feature can’t be used at all…