Edit: RogueLyeshal has already reported this bug at greater detail. Sorry for the unnecessary post!
While wearing the Phoenix Protocol warlock exotic weapons on a character's back are locked in a single position, not adhering to the character's back as they move, turn, and place rifts.
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Hi there, thank you for your report. This is a known issue that Bungie is investigating. Keep an eye on [url=https://www.bungie.net/en/News/Index]"This Week at Bungie"[/url] as well as [url=https://twitter.com/BungieHelp?s=09]@BungieHelp[/url] on Twitter for updates on issues they're looking into. [quote]• Weapons do not successfully attach to Phoenix Protocol when stowed. [/quote] [url]https://www.bungie.net/en/Explore/Detail/News/50995[/url]
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This is a known issue