My H1B petition was approved on 18Jun2014. Later when I checked yesterday the status still shows as Post Decision Activity but reads as "On July 1, 2014, we mailed you a notice informing you that your I129, PETITION FOR A NONIMMIGRANT WORKER, was reopened." Am clueless as the reason is not yet mailed by USCIS. Any similar cases in the past / what could be the reason or impact?