Here is the image you attempted to embed - you need to ensure that the link includes the file extension (i.e. .jpg or .png):

We can see from this that there is no issue with your filter.
Next to one of each of the tracks displayed there is an exclamation mark - if you hover you mouse over that it will display a pop-up message, presumably telling you that the file is missing.
My guess is that you have moved these files (or renamed a folder) outside of MusicBee and duplicate entries have been created in the MB database when re-adding or re-scanning.
My suggestion is to rescan all files (Tools > Advanced > Rescan All Files). Give it a minute to complete and it should populate a list of all missing files and will allow you to delete these entries from the library (look through the list to make sure you are happy to do so first).