I have always enjoyed your bird photos.
Something is wrong and everything is not in focus. What AF were you using. Was it Subject AI or plain C-AF? What size AF area?
Might be some changes you made in setting up the camera. So many people makes changes to the camera without trying out the camera first. I would recommend a reset and then a FW update. Then go out and start using the camera without making any changes, especially to the AF settings. If it works then start making minor fine turning.
Good advice. When I first got my OM-1 I too made the mistake of trying to mirror the setup in my E-M1 III….yuk. I then realized this is a whole different beast, so reset and first let the camera do it’s thing. Then after a few outings where “I” got retrained, we (me and the camera) began to dance. Now we’re good, actually more than good, particularly with my PL 100-400.
I have about a half dozen friends that went through the same retraining with their OM-1s.