Why my thumbnail photos don't change in my listings?
If your thumbnail photos do not change in your listings, you will need to delete all listing thumbnails.
To delete all of your listing thumbnails, go to WPL Backend -> Settings -> Maintenance box -> Click on the Clear listing thumbnails or Clear user thumbnails links.
If you have installed the MLS add-on and use it on your website, you can enable the remove thumbnails option through WPL Backend -> Settings page -> Global tab -> 'Clear thumbnails after updating' field.
It removes them after each MLS update and you don't need to do that manually.