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Peter is onto it. But I am also thinking, could this perhaps be well-bloating in the camera too?
My focusing is purely by hand, using FHWM method in Maxim or APT. I will generally take about 30 minutes to focus, as I allow each minimum value position to settle for 5 minutes to see if it changes much, and remember that when I lock off focus, that it MAY change (since the screw applies pressure and will shift the drawtube fractionally in or out)
It does look like a slight focus issue, (perhaps focuser as mentioned, hence why I RARELY will change to an aftermarket focuser), but perhaps a bloat in the camera???
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