I had the same issue on mine- yesterday. First, check the breather plug to make sure it is free and working. My drivers side axle seal was leaking bad which is what led to all this.

When I removed the breather plug it actually made a really loud "psshhhh" releasing all the pressure!!! I replaced the breather plug and checked the diff fluid level removing the filler plug where there was some seepage. The crush washer was shot.

The fluid was down a little, added some, reinstalled the filler plug with a new washer, and cleaned the wheel off to recheck for leaks.

Today, no leaks anywhere. I will still replace the shows and ale seal, but that breather plug!!! Very surprised....