Joomla Troubleshooting -- Real Estate Website MLS Syncing Issue

I need a Joomla MySQL troubleshooter to fix a Joomla 3.4.5 website for a real estate company. The site appears to work correctly, but in fact, is not syncing properly with the parent database for the multiple listing service. Our site is displaying both "active" properties AND some "inactive" properties that have already sold or are pending. Inactive properties should no longer be displayed. The site runs a repeating cron job to check for new "active" property listings and add them and then delete "inactive" listings, but something isn't working correctly. This is a live site on it's own VPS server. Complete details will be provided to interested parties that show substantial expertise.