What have you done recently to the bike? Everything was working fine and then all of a sudden this happened?
LED bulbs or incandescents?
Easy enough to isolate. Remove one right bulb and check. If all good, reinsert and then remove the other right bulb and check. (Ignore any hyperflash)
If culprit found, take suspected bulb and move to where the "good" bulb is on the right socket. Check again.
If it still does it, it's the bulb. If not, you may have a socket issue or a wiring issue.
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