Bungie Answered
Repeater HPR bugged ui
The ui for the repeater HPR is bugged. As you see in the screenshot the small squares indicating the rarity of the weapon attachments arent correct. In the bottom right there is a gray square even though the weapon can only have 3 attachments. I'm assuming its a bug since the v22 volt thrower only has 3 squares instead of 4. 
<- The squares Im talking about
1
Comments
Hi there,
Thank you for your report and additional screenshots.
We are aware of issues concerning item UI and are currently investigating.
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