Good day! I can report that I've seen a very similar issue. I was using the Quadratic 1-pass method which normally works well for me. In this case it seems to have resolved the focus point but then selected the last sample (value 6166) as the solution. The best solution was 6261. I attached an image and log entries of the autofocus completion summary. Not quite sure why it did this. It's the first time I've witnessed it first hand but I suspect it's happened during long overnight capture sessions as well.

[2022-10-03T21:11:55.342 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - "Image received."
[2022-10-03T21:11:55.343 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - "Detecting sources..."
[2022-10-03T21:11:55.813 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - "Detection complete."
[2022-10-03T21:11:55.814 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - Focus newFITS # 1 : Current HFR 2.92771 Num stars 193
[2022-10-03T21:11:55.839 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - "matchStars: Inputs sized 100 100 found 57 matches, RMS dist 0.9"
[2022-10-03T21:11:55.839 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - "RelativeHFR: sizes: 193 710 hfr: (3.54 (3.04) / 1.28 (1.15)) * 0.93 = 2.59"
[2022-10-03T21:11:55.840 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - "RelativeHFR: orig 2.92771 computed 3.0374 relative 2.58959"
[2022-10-03T21:11:55.840 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - "Linear: solution @ 6166 = 2.58959 (expected 0.932548) delta=1.65704"
[2022-10-03T21:11:55.840 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - "Linear: points=[(6363, 1.85126, 1), (6343, 1.54492, 1), (6323, 1.30458, 1), (6303, 1.01641, 1), (6283, 0.954131, 1), (6263, 0.932548, 1), (6243, 1.07784, 1), (6223, 1.4188, 1), (6203, 1.89872, 1)];iterations=9;duration=489;solution=6166;HFR=2.58959;filter='Ha';temperature=7.75;focusalgorithm=3;backlash=0;curvefit=0;useweights=0"
[2022-10-03T21:11:55.843 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - "Focus procedure completed after 10 iterations."
[2022-10-03T21:11:55.844 Atlantic Daylight Time INFO ][ org.kde.kstars.ekos.focus] - Autofocus values: position, 6166 , temperature, 8.75 , filter, "Ha" , HFR, 2.92771 , altitude, 66.6429
[2022-10-03T21:11:55.844 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - Stopping Focus
[2022-10-03T21:11:55.881 Atlantic Daylight Time DEBG ][ org.kde.kstars.ekos.focus] - Settled. State: "Complete"

EkosFocus.jpg

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