yeah on the mclaren it was the deck-wing.
but don't forget, all wings flex (as mentioned earlier), it's justthe amount they flex that is in question on some of the cars.
the front wing of the mclaren might be fine, and the flexing could be in the tolerance limit.
i noticed it a lot last season too, as the speed built up, the top edge of the front wing flap would go lower on-screen (from the onboard nose-cam), then under braking it would rise up to its normal position again.
RIP Jules, never to be forgotten. #KeepFightingMichael