SharePoint Online List

Hi,

I have a SharePoint list with managed metadata column showing Years - 2021, 2022, 2023 etc

Up to 3 days ago, i have been able to 'filter by' the column with no issues - i could just select the year and filter would be applied.

I now see this when i filter, as you can see, i see alot of letters and numbers - any idea why this has happened?....or more importantly, how do i correct this?

Many thanks