Instagram is now trailing on its new “Shops” tab globally with some selected users. Tapping
onto the feature will lead to the ongoing shopping experience in the app. It includes a list of posts with Shopping Tags added by the approved merchants.
Many users have reported observing that the in-app buttons on Instagram are changing its
place – as it is continually working on its interface. As Facebook expands its on-platform selling features to more businesses, Instagram will also highlight the shop tab with more purchase options, soon.

Source: Socialmediatoday