Oil filter leaking

One thing that could be happening here-look at the oil filter before you install. There is a channel which could trap oil between the rubber seal and the outside circumference of the filter. This could drip out over time if oil gets in there. How would it get in there? Notice how much oil drains out from the cooler and oil gallery when you first remove filter. It will eventually stop dripping but if you're in a hurry to get the new filter in place, some may drip into the channel I mentioned when you're installing new filter. Also if you have drips on the machined sealing area of the mounting plate, that will get squeezed out into this channel. This would account for a few drips from the new filter.

But as I mentioned I can think of two over the years I had to replace due to defects in the metal can. They seeped and dripped.