Hi,
this issue will be fixed with the next theme update. The last two chrome updates brought a different behavior of handling the SVGs.
If you want to fix it on your own, you can do the following:
Open images/dropdown.svg and images/top-a.svg in a TEXT/HTML Editor.
Both have a line of ode similar to the following:
<svg version="1.1" id="layer1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="200px" height="100px" viewBox="0 0 200 100" enable-background="new 0 0 200 100" xml:space="preserve">
simply add preserveAspectRatio="none" to that code. It would then look like this:
<svg version="1.1" id="layer1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="200px" height="100px" viewBox="0 0 200 100" enable-background="new 0 0 200 100" preserveAspectRatio="none" xml:space="preserve">
Regards
Sven