conditions are not working

https://form.jotform.com/71352701119953

this is my form. i dont want total hours to exceed to 16.

i have placed some conditions for that.

but i think so its not working properly for some student because they are submitting more than 16 hours.

Since your form has a lot of conditions and some conditions are related to each other,  I need to ask you to give me a little time to clarify the exact reason of this issue. 
I will update this thread again as soon as possible.

Thank you for your understanding and your patience.

Hello again,

As I checked your account, the conditions seem working as expected. However, I was able to see submissions that have the total hours more than 16. 

So there are a few points that I will recommend you to take care to set the correct conditional logic:

1) Firstly, I see that your form has a lot of conditions that have Missing fields. I kindly recommend you to remove this conditions from your form.

To remove these, Please go to Conditions page and click on the mentioned conditions, click on the gear icon and simply delete them.

2) I saw some conditions that interrupt with the other conditions related to show/hide submit button logic. As I understood the condition logic is the way that mentioned below:

-> If the total hours is calculated more than 16 hours simply hide the submit button and don't allow the form submission.

Also, I saw that the following conditions cause some interruptions and overwriting with the main condition logic above:

As per my consideration, you should remove the conditions shown above and number as third and fourth. 

I hope this points will help you.