Minilogue XD ( Mono louder than stereo ?)

Hi all,
i’m new here and new into the analog world.
I’ve recently got : Mackie 1604VLZ4 - Kenton THRU 12 - Arturia audio space grey - Minilogue XD - MC 505 - TB 03 - SH -01 A.

I’m connecting everything following the right process but i’ve noticed that the Minilogue XD connected in stereo ( Y mono - mono - stereo ) comes up with a lower and background volume. Some presets sound good but others do really struggle, then i’ve decided to try it in mono and all the presets sounds at the same level without any particular background volume.

It might be a super silly question, but i hope somebody will help me out to understand it.

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