Header display goes wonky at some tablet widths

(Bug, Closed -> Fixed, Priority: High, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284of not found, )
User Interface
Summary: In many Querki contexts, on my new Kindle, the green header bar is twice the normal thickness, obscuring the information below it. See screenshot.
Alexx believes this is 800 px.
3y284n2/a2d6451fc603b92428d7c1620d9338254983bca5.png