@carlos-tonatiuh-tovar-zúñiga I know what I'm saying 🙂 I'm at work right now, i'll post a screenshot this evening.
So basically you were telling me that recalbox has an aspect ratio problem, now you're telling me it doesn't happen with SNES ... I'm still saying : TV settings, or you changed some parts of the configuration. All emulators are rendered in an upscaled 1:1 PAR. For performance reasons, ES is rendered in 1080p but emulators are in 720p (except N64 which is in 640x480). When you say FBA, do you mean piFBA or fba_libretro ?
The screenshots I made were not with my phone but a direct capture of the GPU framebuffer. So it's exactly what Recalbox produces as output to your screen.