Konica C258 prints alternate trays

Hello, we did recently replace our old Konica 224e with a Konica C258 but it acts strangely, and I do not know if factory settings need to be changed or something else.

The problem occurs at instanced we do a multi-page print and explicitly choose Tray 2 dedicated for special fine paper, and only the first page is printed out from Tray 2 and subsequent pages prints from Tray 1 (regular paper.)

I have never experienced that the trays used is alternated during print-out, so al suggestions are appreciated. Thanks!