Picture position on CRT using RGB mod

[Wizzard]

I have noticed that the picture generated by my RGB modded Junior is a little narrower than the picture from another source. There is some empty black strip on the left side. This is not when I am using another source, like Raspberry via analog AV input. Is that a problem of RGB mod, Pluscart or my TV? I do NOT have any other cartridge to test, neither another Atari.

 

Atari 2600 Junior RGB:

 

Raspberry Pi using Retropie with analog output:

[Thomas Jentzsch]

It is definitely not the PlusCart.

 

I guess there is a problem with the input signal.

[Wizzard]

Yes, seems like Atari is generating less rows than another source. I wonder if is it normal or a bug.