Pad section and Mono/Normal mode : always polyphonic ?

[soundphase]

Hello all

Update 2.01. I chose the Pad Section / P5 tab / Ambient Theme voice for the R3 voice.
In the voice part setup screen (Voice button), I clicked on "Mono" icon in the Right 3 part.

Strange... The sound is always polyphonic.

If I change the "mono type" (Normal > Legato or crossfade) with the "voice edit" option, it's OK, the voice is now monophonic.
It's the same behaviour with the Left part.

Did you know this behaviour ? Is there an explanation ?

Regards
Soundphase