Fix sale badge according some case

Hello, In my website [login to view URL] appear a flash-sale badge when the product is on sale. I have add another custom field, which if it has value, then the flash-sale badge appears again.I bulk list my products and always i add value to the sale_dates_to field. The problem appears when the sale_dates_to day pass and an automatic sales_woocommerce cron running and delete the transients. Then the sale_dates_to value deleted and the flash-sale badge appears without i want it. Exclude for that some cathgories. Please read the associated files. Regards