Running Extended coupons version 2.6.2 and Woocommerce Subscriptions 2.2.18 (latest versions of both).
One specific variation of a Subscription product, when added to the customer’s cart, causes the entire cart total to only be that of the subscription product. So if we have three products:
Widget A $10
Widget B $5
Subscription Product $50
The total is $50 instead of $65, where Widget A & Widget B are not calculated. If you add Subscription Product to the cart, the total shown in the Woo total is initially set to the correct price, but then quickly changes. Disabling WECF removes the problem.
Happy to provide login info to a staging area if that would be useful for troubleshooting. I have logging turned on and can supply that if you’d like, but have disabled the plugin for now. Thank you!