Check the details here: https://support.woopos.com/knowledge-base/woocommerce-data-synchronization/
The QOH will not sync from the web to POS if the SKU exists in POS. Only the initial importing will import QOH. To manually sync, you need to export QOH from WooCommerce to a file and then import to POS, or delete the SKU in POS first.
Product description and variations can be re-import with the “update/overwrite existing POS product info” checked on.
You can use “Delete All Data” from left side menu and re-import everything from scretch. Or email us if you want to delete the product info only.