Logo and ad issues on Sparkle theme!!

Hello support.

Please can you help with some issues that, no matter how hard we try, persist.

1. Logo issue
Our logo appears perfectly fine on Google Chrome (see example), however, it becomes quite messy when on Internet Explorer (have a look!).

For some reason, the logo increases in size and actually drops outside of the main navigation bar. This has nothing to do with the ‘zoom’ set on the browser, as I’ve checked. Meanwhile, this issue persists on different computers, screen sizes.etc. So it must be something else. I’ve tried to reduce the logo size but it has no effect?? Help?

2. Ad issue
Oh, so many ad issues. The theme doesn’t seem to support ads very well.

We have a ‘pushdown’ advert running, which occasionally appears and is supposed to kick out the standard 728×90 ad unit. But sometimes, both the big pushdown ad AND the standard 728×90 banner appear, one below the other! Only ONE ad should appear under the navigation bar!! Have I placed the code incorrectly?

To show you an example, the pushdown ad should display like this (see) – only one big banner appears rather than 2 ads!

Also, ads tend to shrink (see) and hide behind the sidebar content (see) ?! And before you say the ads are meant to re-size to fit the sidebar, this is not the case (see, some work fine)

Can you address each point, please? It’s all a bit of a mess.

our website