Unless I am missing some totally obvious (wouldn’t be the first time), my guess this there a missed marked pad stake. And possible a misunderstanding on pad vs ff. I see a pad for 440.93 on one and 440.00 on others, and a ff of 440.67 (8in slab which is typical).

Edit: The 440.93 pad is also mark for a cut of 0.93. So I guess they carried that .93 over.

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