Honorary Cloud Strider Triumph is 13/14. I have claimed everything from Nimbus and I am rank 54 with him. This is the only thing I need for the "Virtual Fighter" title. I know bungie doesn't give a damn about fixing issues like this. As long as I keep buying Silver and DLC.
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Closely look at every item and make sure they're all ticked off If you're convinced you've claimed everything then can you screenshot your Nimbus vendor screen and link to it here?