Hi Sonny! Welcome to IRV2! We’re sure glad you joined the gang here!
Have both rows of lights been turning on with the same switch? If so, there may be a loose connection at one end of the connecting wire between the two rows. Sometimes the production folks don't twist the wire nuts tight enough when building the RV, and the connection can work loose over time as the wire vibrates during travel.
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD