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Google Analytics Content Grouping - sometimes pages appear under 'not set' group

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# 1
Visitor ✭ ✭ ✭
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.