This is a known issue to EVERYONE with the Galaxy S3 on AT&T. That OTA update a few weeks back is not in the list of supported firmware versions in Kies, and as a result, Kies is treating our fully legit phones as if we have put a custom "ROM" on them. I wouldn't worry about it since we SHOULD be able to get JB as an OTA update when it comes out. Samsung could potentially update Kies to support the current AT&T software version.