XF 1.4 Adsense Responsive ad - Arrows appearing in navigation

I have placed responsive google adsense code in ad_header placement,
Initially it was not fixing properly,
previously i made some header, navigation size adjustments,
i thought it would be the problem,

then i reset everything to default.

Now there is a <.span class=arrow css> property appearing in navigation tab,

please check image,
how can remove that??

Edit : Problem solved, so i Removed the Image, That looks like ad :)


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The ad is too wide for the available space, pushing the logo and other content down.

Use a narrower ad unit.
Thank you Brogan,
But its responsive ad unit,
when i used leaderboard ad, it is showing wide header in mobile devices :unsure:
any solution??
to show the ad correctly for all devices,

so Google responsive ads not working in header placement??