devtrackers.gg
Did those stats actually apply to the user all the time- or perhaps only when the flask was active- or not at all?
The stats started applying when you equipped that flask, and were removed when you removed any flask (because items being equiped and granting stats is fundamentally is built around single-item slots).
Any change to an item technically removes and replaces it (this has since changed, so that changing only the number of charges a flask has doesn't require an internal remove/replace), so this was inconsistent, and you'd gain and lose the stats based on which flasks you used.