Why grease leaking onto my wheel?

[Emerald]

Hey Guys- jumping in kind of late but I've gone through two $130 axles from Pelican in less than 2,000mi. I bomb around almost exclusively on tight bumpy roads. JayG seemed to have some good luck with some aftermarket axles and I'd love to get the brand, etc. My 2002 S has 84,000 miles and is a major money pit. It literally spends more time on Jack Stands than the wheels. So when it's actually on the road I'm going to pay it a lesson. Thanks, Craig