i Need some help understandig PS1 video output

[/playstation]

So basically i got this PS1 a long time ago, It was modded so It did output black and White with the composite cable, so i bought a rgb One on Alì express, and now i see in color the thing i dont understand Is, why when i play pal games they show in 4:3 with Little to no black bars on top an bottom of the screen and then if i play NTSC games they show in 16:9 with thick black bars, and this happen on my grundig TV and then if i switch to my back up lg crt, all pal and ntsc games play ful screen but with i tiny vertical strip right of the tube, but If i plug something like a DVD player on both TV with a thicker RGB scart It plays 4:3 full screen, and 16:9 with black bars as It should, thanks for any help
P.S.: im italian so, Sorry for my bad engilsh

submitted by /u/Tilt-Six
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