Column Filter by Date, dates are listed numerically not date order?

Hi,

I've noticed a new "feature" when filtering a date column by Date, when the filter check boxes appear they are in numeric order and not date order.  I have access to a couple of tenants and it only appears to be happening on one, so is this a feature rolling out or one being retracted.

A bit more details, when selecting the "Date" column I am selecting "Filter by"

Then when the flyout appears all the dates are ordered numerically, which is about as much use as a chocolate tea-pot.

If I do the same on another tenant the "Filter by 'Date"" check boxes are sorted by calendar date

Could this be a setting thing or maybe another column type causing this behavour?

Any help gratefully received.