On a rear wheel, DS spokes will have higher tension than the NDS spokes.
That's how you put dish in a wheel.
However, the spokes on each side should match each other on a properly tensioned wheel.
One broken spoke can be a fluke. More than one, expect the popcorn effect.

You might give the spokes a good squeeze test. Take adjacent pairs and squeeze them together hard. IF that pops another spoke......