80d focus points

[chief54]

When shooting BIF sometimes bird is in focus other times not. When using single point or zone 9 focus points I will check where focus points locked in they show locked on bird/birds and shot is not in focus, or when shows focus points locked on background and not on bird/birds they are in focus as in image below any ideas why?

[ebiggs1]

"...same sequence two frames later ..."

Same thing.  Time lag and incorrect panning.  The AF locked and the shutter fired but you were off target.  The AF will not refocus until you release the shutter in One shot.  In Ai-servo it will continually refocus but not necessarily on what you want.

Let's go back to basics and get your confidence back up with a few good shots.  Slowly graduate to the move difficult faster birds.