Issue on put correct format date time scale on Bar chart dashboard

Hi i' m Diogo and I'm trying to leave a correct date format on the scale of my dashboard "Bar chart", but sometimes the chosen format is changed depending on the variable of my dynamic filter. I would like to know if it can be configured for this scale not to be changed.

I chose this format “2021-09”, but sometimes my scale automatically changes to this format “04/01”.