Left only 4iiii Power meter

Just finished a ride and normally on my wahoo at the bottom on my ride summary page it shows l/r 100/0 as it’s a left only power meter. When I finished tonight it showed 4/96. So either someone has put a right sided power meter on my bike without telling me and I’m excessively right leg dominant. Or somethings not right with the power meter. Any ideas? It’s zeroed before every ride.