solved it... for all people with the same problem... go to recalbox\share\system... edit the config by changing global.ratio to 4/3 .
then restart your recalbox, after you have saved your config of course... now it works fine.
@deymos Please ask the theme creator, in the theme topic, as the theme creator is responsible for the theme.
Themes are created by users, and each one has its quirks, so only the creators can provide more accurate support.
By the way I checked and hooked up via RCA to a new TV Sony KDL 720 and it's not smooth and j**ks the picture when playing Sonic 3. the TV is new and supports all standards...