Hi David,
until Google Adsense started with the Anchor Ads, the code was fine. I deleted now this line but I’m not sure, if this solved the problem. I purged the cache but now I see for a second the stretched button and then it turns to normal.
Here how it looks when an AD is shown. Probably you can check from your side, what you see.
I purged each cache I could find (WP Rocket, Ezoic, Cloudflare, my browser) and waited some days but the situation is not much changed.
Sometimes it looks like in my first screenshot or it looks like this for a second and becomes then small, or, as I found now, the button stays behind the anchor ad and can not be clicked screenshot
My idea would be to place the button higher so it does not interfere with the anchor ads.