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As Jari eluded to, you were just missing telling the Chart component which items it needs to submit to session state when it gets refreshed (eg page items that are referenced in the query source). You do this by adding any page item names, comma separated if there are > 1, in the 'Chart Attributes > Chart Series > Series Query > Page Items to Submit'. I added 'P1_X' for you on your page, and I believe this now works as expected.