The string does not contain a supported hash type - such strings are written to a separate file if the "Save unsupported" checkbox is checked. For more information on hash types see here
The hash is the first column in the file - try changing the ITEM:HASH to HASH:ITEM
Hashed data are not passwords - sometimes authorization tokens from other services are stored instead of a hash and they look like a regular hash
Password generated - if the length of the generated password is large, then it is almost impossible to decrypt it
Hashes with salt - salted hashes can only be decrypted using a video card, since there are all password combinations for each combination of salt. If the file does not have a field with salt, it does not mean that it is not "salted".
These passwords are not yet in our database - usually in this scenario, the result is non-zero. We collect everything that has not been decrypted at least once a week and add successfully decrypted hashes to the database. Keep an eye on the date of the last update so you know when to try again.