6.2.14 mobile: on tap: "jumping" swiss logo

on iphone ios 7.02

open
http://mf-geoadmin30i.bgdi.admin.ch/main/prod/mobile.html?lang=de&X=190000.00&Y=660000.00&zoom=1&topic=ech&bgLayer=ch.swisstopo.pixelkarte-farbe&mobile=true

tap

result:

the logo disappears and above the loading circle appears: impression that the swiss logo jumps

expected result:

the loading circle appears at the same position as the swiss logo