Bicester were surprised to see opponents High Wycombe have 16 players on the field while they scored a try in their Southern Counties North League clash on Saturday.
Bicester coach Clive Davies said: "It appears that a player being substituted had not left the pitch as play restarted."
Wycombe's victory - they won 30-10 - was already in the bag so the error did not turn the match.
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