it is probably AI servo. I know I do this all the time with the (rareish) wildlife shots I do. Set to AI servo, because I want snappy focusing times, then try and reframe because I dont want grass then subject bang in the middle (rule of thirds). This, amongst other reasons, is why the more advanced cameras (read; more expensive) have loads of focus points - so you can do AI servo mode with out of centre. My camera only has 3 focus points, and AI servo only works with the centre one lol.
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