User blog comment:DominatetheFreedom/Is creating a tabber is kinda difficult?/@comment-5724614-20170327033123/@comment-5724614-20170327102223

Those were never meant to appear. I had filed a report about the Visual Editor's problem to Wikia and they admit that blank spaces between the tabbers are indeed glitches. Even if you use source, don't make your own glitch.