Why the quantity number is not showing in submissions email?

I have just tested your form and I can see it allows to enter any amount, example: 

Is the quantity box blocked on your end? 

Please provide us more details about the issue. Also, I have tested with this form http://www.jotform.us/form/72806349778169, is this the same where you're experiencing the issue? 

Please let us know if it persists. 

Yes, it allows you to enter any amount and proceeds as normal through submission yet when I receive the submission order, there is no quantity amount listed.
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The issue is in the name of the field of your Purchase order:

It has an empty space, remove the space and it will work fine:

Let us know if you have any further questions.

Thank you!

You mean I just need to remove the space between the words “karmic stones” and change it to “karmicstones?”
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Yes, exactly that, I tested your form after that change and everything was working properly.

Let us know how it worked for you.

Thank you!