Diceman when you see varying results like that often its a peak in the future or the past. If you’ve never been a PR4 before and you saw it for a day or so then it reverted, chances are good that (a) there may be a PR update in the next weeks and (b) thats probably your new PR
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I also saw some fluctations last week but had not said anything because like you I thought I was hallucinating.
someone may correct me if im wrong, all i know i learn from experience.