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It appears you may have MULTIPLE Marks on the same position. Try selecting just one of the circles via lasso and see what the bottom left marks count tell you how many marks there are selected?
Hi John. Thanks for your help. I don't know whether working with the lasso tool instead did something functionally but whatever it is it appears it's now filtering the way I expected to earlier - with both tools! I tried highlighting the outlier circles with the rectangle view (which I originally used) after my successful lasso attempt, created the group, filtered, selected 'Other', and now it was showing me the graph without the outlier points. Awesome. Thanks so much!