I guess that you have imported your note data from another app? I say this as some of your tags are mixed or upper case which you can have after an import but not for tags created in Joplin. Joplin itself does not use mixed case tags.
Being a long term Joplin user I cannot test this myself as I have no mixed case tags and I cannot create them. Try searching tag:Allocation to see if, for some reason, tag searching is case sensitive.