Assuming that these “other items” are ones that you may have imported from another password manager, it is possible that the data were not correctly imported (or that the data were not correctly exported by the original password manager).
Could you manually open one of these vault entries that isn’t working, then click “Edit”, and copy the text string in the URI1 field? Please paste the copied string into your response (if possible, please use the Preformatted text format in the forum text editor, which you can apply by highlighting the pasted string and clicking the </> button in the menu bar at the top of the composition window).
In addition, if you have knowingly made any changes to the URI Match Detection Method options, please let us know what settings you are using for the global default and for the specific URI.