I just checked that Twin Pines Program in your (In 1 / Out 1/2) configuration.  Definitely dry & wet out both speakers.

All that immediately comes to mind for diagnostic purposes: Check your System – I/O – Jacks to confirm that the H90 is sensing both outputs correctly.

Or you can try Bypassing the Polyphony Preset, to isolate the Prism Shift Preset.  The way it’s configured, you should be getting the High to Low voices panning right to left (-0.8 Spread).