Why is the wheel bearing grease leaking out of the dust cap?

All grease liquifies and separates. Drive it and it gets hot and most times turns to a liquid type and that is what allows it to “flow.” I’m no chemical engineer but in my 40+ years in this hobby I found out the cheaper the grease the more wax is in the grease. It’s a filler. The color and lubrication come from that liquid. I hope I am describing this correctly.
You need to drive your car more. It they sit the grease separates. Even a can of brand new wheel bearing grease has a layer of liquid on top when you pull the metal seal open. Mixing it all up prevents that but only for a while.
Wheel bearing grease from the 50’s and early 60’s was like tar. It was created from oil called bunker “C” if I was told correctly. It was awful. It smelled bad and was impossible to get off anything. It took incredible amount a of heat to make liquid.
Syleng1