Google Analytics Content Grouping - sometimes pages appear under 'not set' group
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I've enabled the content grouping on a site with Universal Analytics. The grouping is enable directly in the Google Analytics tracking code, so pages is grouped every time Google Analytics register a page views. ga('set', 'contentGroup1', 'Group1'); When I check the reports, I see a lot of pageviews in the group "not set" but if I check the pages in the results, i see the same pages appear in both groups: "not set" and the "Group 1" (made by me). Why this happen? I've checked with Google Analytics Debugger and the tag are fired correctly. Thanks in advance.