Got more photos, I removed a section of the soffit and pulled back some of the metal trim, sadly I couldn't get my head up there because of a beam so I stuck my camera in and got some pictures.
In this picture you can see the top of the post it seems there is a cut 2x10 on it's side that sits on top of the post. Then I think there are a few 2x2 or something on top of that then the beams coming out of the house and garage.
These are from below, unless I am missing something it looks like everything is just resting on the post. It doesn't look like they are attached, does that even make sense?
I couldn't see any signs of water damage up there, the closest gutter is one solid piece so there are no seams for water to leak out of and the top of the post looks to be in perfect shape.
We replaced the roof last fall and the roofers never mentioned any rotten wood or issues in this area. We haven't had any rain since I discovered the issue but I have never really noticed any water running down the post or pooling at the bottom.
I was talking to a co-worker that lives on the same street and he has the same problem as we do, he was actually planning on replacing it this summer. Our neighbours have already replaced theirs.