When user add any word under coupon field, prices reset to 0$.
1. Addded product to the cart
2. Add "test" word to coupon field.
3. Select "Apply coupon"
4. Prices becomes 0.
I currently can't reproduce the same on my end:
If you are able to replicate this with a fresh install of Magento I suggest filing a bug report under https://github.com/magento/magento2/issues with exact details on version used and steps to reproduce.
Thanks for your reply..
Can you please go through the below forum link: