Fireteam Power is intended to raise low-power fireteam members to 5 below the highest member's power. This is not functioning for some players. Anecdotally, I've only seen this happen with characters that skipped the New Light tutorial.
This does not appear to be an uncommon bug, as it has also been mentioned outside of Bungie's official help forum, such as in this Reddit post: https://www.reddit.com/r/DestinyTheGame/comments/1u66qzb/fireteam_power_is_broken/
The attached video shows this bug occurring, with the text stating that my Power will be boosted, and the evidence that this is not functioning.
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Hello there, Thank you very much for reaching out to us. We've received reports of this issue and are investigating the underlying issue further. For any updates that may come from this report, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url].