Hi Anastasia,
Thank you for your patience on this,
In general, B2BKing can conflict with other plugins that change the price of products. Usually such plugins use the same hooks that B2BKing uses to modify product prices, so the results are unpredictable, as both plugins modify the same functions without knowledge of each other.
To solve this, I think there are a few different options:
(A) Apply a coupon that adds discounts to the cart totals area (but not changing the price of products directly). E.g: https://prnt.sc/KVbBhfK7pFV_
If you had such a discount that is added to cart totals, that should also work with B2BKing as there would be no conflict over the actual price of each product.
(B) You can disable B2BKing pricing features if you do not need them (I am not sure what B2BKing features you’re using). To do that, you can enable these switches in B2BKing -> Settings -> Other -> Components: https://prnt.sc/oxCZgQ4pPdjO
Could (A) be used here? I think it’s generally the easiest option, and it’s how WooCommerce coupons are normally added (they are added at the end of the cart rather than changing the product prices).
And are you using B2BKing Pro or the B2BKing Core plugin? what B2BKing pricing features are you using if any?