Link to test case: https://jsfiddle.net/6Lx8ncyr/
Error messages shown: None
Description of problem:

In the linked example the table display fine using the normal Bootstrap 3 styling. The responsive plug-in is set to false. If you change the responsive to true and run the code you will notice the header for Chine Free Stock overlaps the In Production header. When inspecting the code it appears a colspan="2" is being inserted into the Free Stock table header cell.