conflict with default woocommerce sale price

I am experiencing a bug with your plugin. When I create a new product/edit an old product with a sale price and I don’t want to show your counter (= normal and current woocommerce offer), the crossed out regular price no longer appears in the frontend. Only the sale price is displayed. If I activate a start / end date of the counter, the regular price crossed out is displayed there. The thing is, I don’t want all discounted products to have a sale start and end date.

I have detected that if I deactivate your plugin, I create the product with the offer, and I activate your plugin again, in this case the price is crossed out.