How to solve dropdown list filter can't show the dropdown value

I add a filter in dashboard:

the value of color is black and white:
but the value can't show in dropdown list

how can the value show in dropdown list? There is the same problem in others dashbord.

please check if the field is a category on settings->admin->data model->database->field

I can't have the permission of doesn't seems that a problem about filed type.

The tip message is above.

Please check with your admin