I'm getting an error I don't understand from the infamous OW website RTW planner

Your trip may include two stopovers over 24 hours in the continent where your journey started. If your itinerary includes both of these in your country of origin, one must be outbound and the other inbound. Additional stopovers under 24 hours are permitted in your itinerary. Please select a different date or flight.

I do indeed have 2 stopovers over 24hrs in my continent of origin, one at LHR and the other at DOH (highlighted) but I thought that was allowed.

OSL-LHRx-MIA-SFO-DFW-ICN-HKG-SIN-LHR-DOH-LHRx-OSL

By contrast, this shortened itinerary with only one stopover in Europe is accepted

OSL-LHRx-MIA-SFO-DFW-ICN-HKG-SIN-LHR-OSL

Please could someone explain the error of my ways. Many thanks.