My grimoire says I have 45 calc. Fragments but my game says I have 44! I've been grinding on this for a while this is a big let down
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The game (on the Dreadnaught map) displays the number of fragments found by the currently logged in character. The grimoire displays unique fragments found across all three of your characters. You can see a character specific collection lost on the progress tab of your legend on Bungie.net (web site, not app).