Sort by Card name (alphabetically) not working.

Sort by is not working but olny for one column. I can suscessfully sort any other colum, just not this one. I've turned off all our automations. And card get moved into this column from the columns before it, that are able to be sorted, and when completed get moved to the column to the right which also can be sorted. So I'm not sure why one particular column behaves differently especially since there are no automations running.