API refresh option and sort properties

We have a wordpress properties website which is connected to API and run CRON job on daily basis. The issues are: 1. Sometimes "For Sale" on first and second page the properties are duplicated (often in morning, must be some cache issue) 2. on API there is a new option to refresh the property and property will jump to first position, so we need same function on our site to happen with API 3. "For Sale" page its sorted proprties by price, sale agreed, sold. Properties with price has to be sort by modified date. now they are mixed or dont know what order is there. PLEASE JUST EXPERIENCED PHP DEVELOPER!!! ====Please Type PHP EXPERT=====