I see this quite often on a roundabout near home. It is a four-way roundabout and the sign shows the entry / exit at the usual 12, 3, 6, and 9 o'clock positions.
I see it when cars are travelling 6 o'clock to 12 o'clock, so I would not expect a right turn indication. The 12 o'clock exit is just beyond that - more towards the 1 o'clock position, so I wonder if it stems from the traiining that exits beyond the 12 o'clock position is a right turn and needs an indication. Only a local would know this as there are trees an bushes on the island blocking the view of the exit
BTW the third exit is no through residential road with not that many houses.
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