In tests (done by @Charlie_WMDE, @James_Budday), users remarked that they did not expect the revision slider to be behind the current "Browser history".
There may be several problems with the page (like having too many unstructured elements there that visually compete), but we could make clear that "browse history" is not a link back to the history page.
(Partly a) Solution: Change the title on the flyout/accordion to "Browse history interactively"
Info for the Hackathon 2018
If you are interested in working on this at the Wikimedia-Hackathon-2018 , @WMDE-Fisch can help you with any questions!