UPDATE --> This Error Appears when There are more Than 16 links in Navbar, it doesn't matter whether they are in a drop-down or alone.

Hello, I'm working on PHP system where I encountered Cannot modify header information - headers already sent by...
The Navigation Bar is fully functional, and the application works as long as I have 2 Dropdowns in the Navigation Bar.
If I add a 3rd dropdown with even exactly the same code as the other dropdowns, it keeps functioning in the Navigation Bar, but it destroyed sent headers for some reason.
This Can be Noticed When Submitting a form and redirect using header command in PHP. The Whole System Gets effected by this error upon any form submission, and it's all because of bootstrap.
The reason I'm 100% Positive it is Bootstrap is:

1. All Forms return to be redirecting normally if dropdowns are less than 3.
2. The error disappears completely and everything works as it should be.
3. The Navigation Bar doesn't get effected at all, all links work even if there are more than 3 dropdowns, the issue is if more than 2 then I get headers already sent by my PHP code without even changing any bit of the PHP code.

Any help is much appreciated.

Thanks in advance.