New Invoice Cannot be generated

I have created few products and try to generate an invoice but some input fields are set β€œ-NaN.NaN” values . I am not able change those values as well.

Shipping Tax:

Invalid Value: Shipping Tax
Invalid Value: Tax
Grand Total:
Invalid Value: Grand Total

When raising issues it would be great to know more details like:

What SuiteCRM version are you currently working from?
Is it a fresh instance or a upgrade?
What browser are you using?
Whats your server environment (not too much of a big deal here but still good to know)?

It’s Suite 7.8.3 and its a fresh installation.
OS : Windows
Server : WAMP
Browser : Chrome