I'm not sure how to link to an example since it happens on my phone, but I'll try to explain it better.
Say I have a page open in Safari, and then I want to look something up on google. I'll click the little button on the bottom right and then click new page.
I'll then browse around on google, visiting a few different pages.
After I find the info I want, I click that little button on the bottom right again to navigate back to my original page.
But there is no original...