Since all planners (DB, ÖBB, SBB etc.) show mandatory reservations for these trains, it's likely that SJ include this in the timetable data they send to the European Timetable Centre (MERITS). SJ is sending the wrong info to MERITS. If you read about the SJ regional trains on the SJ website you see that the reservations either are optional or not possible to make. Interrail also states reservations on SJ regional trains as optional or not possible to make in the information about Swedish trains. Oh, thank you very much for your detailed answer :)
If you go with the SJ regional train via Örebro, you don't even need a reservation to go between Stockholm and Göteborg. Are you sure that I would not need a reservation for that train? Everywhere I looked for that train said that I would need one.(I looked at Interrail, SJ and OBB)
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