Oil dip stick pops up...why?

[scottsubarus]

New owner of 92 SVX. We have noticed that when ever we drive the car...even a short distance on the hiway when we come home and look under the hood the oil dipstick has "popped up" and is not snug against the filler tube. thinking we had too much crankcase pressure I removed the oil fill cap while engine running but there was no puffs of air coming out. Engine runs good what gives???? BTW valve covers esp Pass side leak. ordering gaskets for them today.

Scott
Omaha