It was hitting the jamb on the bottom. The hinges seemed tight, so I just hit it with 40 grit sandpaper since it’s solid wood. Hit it with some sealant and it looks good as new.
I had to retighten the handle too. When I went to do the final test I was a little worried it the handle might not work correctly so I made sure I had my phone, my leatherman, and a bottle of water “just in case”.
I was surprised and very happy how well it came out.
Thanks! I will have to check this at some point!
If necessary (probably only if the door frame is old and damaged), you can also shim up the hinges with pieces of cardboard, cereal box, wood veneer. Whatever you need to do to get the door aligned in the door frame. The entire world is wedged together with shims.
There might be some adjustment on the striker plate in the door frame, too. That might require nudging, tightening, shimming, just like the door might.