Training result: High VO2 max impact but still, VO2 max is decreasing

Hi all, it's probably me not understanding correctly how the training results work when you finish a run and go through the data pages with all the information provided by the analysis of the last run. To make the long story short, I've just finished my run and received the result of my training, which was "High VO2 max impact." Happy to see that, since I'm quite addicted to VO2 max info, but afterwards, when I scrolled down to the VO2max widget, with the history of my last training sessions, I noticed a significant drop in VO2 max corresponding with my last training, which was supposed to be a "high VO2 max impact." So what's the point? Wasn't it supposed to show an increase instead of a drop? What am I missing here? thanks to whom is so kind to clarify this point.

UPDATE I've added two pics showing my last run results and the VO2 max history (before my last run it was above 52 and now , after my run, it's close to 51