The top toolbar on articles is showing incorrectly lower in the screen on Essential phone device.

First reported on OTRS https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=10446613

Steps to reproduce

Pre-requisite: Bug may be specific to the Essential PH-1 phone

1. Open an article without a lead image (e.g. Pareto principle)
2. Scroll down in that article
3. Navigate to another article now with a lead image (e.g. Kotlin (programming language)
4. Scroll down in that article

Expected

Toolbar should appear initial (steps 1 and 3) at the very top of the screen, then scroll off upon user scrolling down (steps 2 and 4).

Actual

Toolbar appears about a 3rd of the way down the screen, and remains in position for a while when user starts scrolling down before scrolling off screen.

Actual - article without lead image	Actual - article with lead image

Occurring on

Device: Essential Phone PH-1
Wikipedia App Version: 2.6.203-r-2017-08-28