That is indeed strange. I researched your issue and found that someone reported the exact same problem as you.
When configuring an nFeed field to appear on a particular screen (for example edit screen) and then mapping a behaviour to that field that sets the field to be read-only, a brown box appears around the label of the field.
More info here: https://productsupport.adaptavist.com/browse/SRJIRA-2138
I hope that information helps.
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