Google changed the way Chrome handles tabs in Android Lollipop. By default, tabs no longer live within Chrome like they do on the desktop.
Instead, when you hit the multitasking button you’ll see each tab parceled out as if it were an individual app. The advantage is that it may be easier to find that last tab you were looking at because this view puts the site’s icon and name at the top of the card.

Once you turn off the merge tabs and apps feature, your tabs will all appear within Chrome.
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