I was able to reproduce this issue on Apache 2.2.22 with a legitimate method:

  <LIMIT GET>
  Allow from x.y.z.v
  Deny from all
  </LIMIT>

  for I in `seq 1 100`; do curl -sI -X OPTIONS http://myhost/ | grep ^Allow; done | uniq
  Allow: ,GET,HEAD,POST,OPTIONS
  Allow: GET,HEAD,POST,OPTIONS
  Allow: ,GET,HEAD,POST,OPTIONS
  Allow: GET,HEAD,POST,OPTIONS