axle vent tube

i have changed my axle gear lube about 2 months ago,
filled it up level with the fill plug hole, and now i have it all coming out of my vent tube... whats that all about?

maybe im making turns too fast in the bronco. lol

Maybe the vent is partially clogged causing pressure to build up and puke fluid. I'd remove it and clean it with brake cleaner and an air gun. You did check the fluid with the vehicle level correct? I've seen people fill the rear while the rear end was on jackstands and the front wheels were on the ground causing an overfull situation once the vehicle was level. (if the fill plug is in the rear cover)