You could call it a failed reduction and take him back up if you don't see any low green today/tonight.
The FS does cloud the picture a wee bit.
Creates a bit of uncertainty, the FS will have depleted the depot, then the cycle following the fs he dropped into green and she seems to be bouncing of that. You might want to wait to see where she lands when she clears the bounce, and if she doesn't get down into a good range for her nadir then take her up.
Sometimes they do bobble about with the doses. The food steering is supposed to help. Perhaps pay special attention when he has just earned a reduction, to avoid (if you can) her earning a reduction to close to a previous one, when the depot of the larger dose is still playing a role. Though if he does drop below 40, no messing around take the reduction, if it fails come back up (like you are doing now)