As reported in this thread (above) people that have hit 200 marks in their inventory stop receiving them, but continue to deplete their weekly limits. This has to be a bug as players are 100% losing what they earn and nothing can be done to get around it if people don't have their rep up.
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Thank you for the bug report. We are aware of the issue and have a Help article up about it: http://www.bungie.net/en/Help/Article/12231. We will pass your report to the team.