EOS R7 Bird photos are backfocused

[vtforester]

I have an R7 on which I use an EF 400 5.6L and a Canon EF-RF adapter, primarily for taking photos of birds. I have noticed that most of my pictures are backfocused. It is as if the camera is not taking into account the extra distance the adapter puts between the lens and the sensor. Has anyone else experienced this problem? Is there a solution other than getting a new RF lens so I can skip the adapter? Thank you for your help.

[vtforester]

Thanks Stephen. I had the camera set up with the setting you suggested because at first I was thinking that it was a tracking issue. Even when the focus point is right on the eye, it grabs focus behind the bird. 

[vtforester]

I agree about the high frame rate. I have been using a slower rate from the start because I didn't think my old lens could keep up.