No, finding three dates on a death record doesn’t mean your Norwegian ancestors had to be buried multiple times. But it can be confusing! Look at this 1879 record for Anne Olsdatter Farsjø from Sannidal parish:
The first date on the left must be for Anne’s death. What then are the dates labeled “b” and “j”? The Norwegian Word List at FamilySearch (https://www.familysearch.org/wiki/en/Norwegian_Genealogical_Word_List) can be helpful here. The “b” is likely begravelse, which can mean burial or funeral. The “j” must stand for jordet, meaning burial. So, since the “b” date is also earlier than the “j” date (remember than the dates are written date/month), the record must mean Anne died Dec. 12, had a funeral Dec. 21, and was buried Dec. 26.