After replacing the bulbs and flasher relays, when I turn on my lights not only do the rear running lights not engage but the brake lights no longer signal?

I’ve recently changed out my bulbs and flasher relays. With my lights off everything works fine. However, when I turn on my lights not only do the rear running lights not engage but the brake lights no longer signal. My left turning light in the rear doesn’t flash, it just stays on and my right turning signal works just fine. I’ve checked fuses and wires under the dash to see if something is cross wired or exposed, but I didn’t see anything, and my grounds all look fine. I’m really at a loss with this right now.