PS2 PS1 disc on PS2, black borders

[Baptism]

Hi,i burned some ps1 games and i tried them ,they work great but all of them has some kind of black borders around them is there anyway i can get rid of it ?
my ps2 is pal scph 77004 modchipped (M-7 MP-788) i play on a crt through scart with 4:3 aspect ratio
i also tried pal and ntsc games, still same issue
i also tried same games on popstarter they didnt have this black border

thanks