That sounds unfortunate. Thanks for your report, I'm not a Bungie Employee, but hopefully someone from the team can investigate. Any additional information as to the timing and such when this happened and what platform will surely help them.
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PS4, PSN Californinja17. It happened last night 12/9/14 just after the reset and when the new DLC came out we did Hard Mode Vault of Glass. Its pretty sad because I have a maxed out with old stats and another drops again but still old stats base damage was 274 instead of 302 that a guy got from nightfall. I wish it can get fixed.