had valve cover gasket leak so replaced all the gaskets and spark plug tube seals but now have oil leak in one of them coming from underneath the spark plug any ideas what would cause it to leak from underneath?

 

welcome to the forum you may have pinched or rolled the spark plug tube seal.

 

It would be very rare that oil would be coming from the spark plug unless the plug were cross threaded when installed??
Could the spark plugs themselves have been damaged during install?
My first stop would be to inspect the spark plug tube seals

 

if it was the tube seals would leak on top of spark plug but the top is dry only the bottom of the spark plug has oil on it

 

Gravity pulls everything down??