Can't full delete old image...

Hi,

I've added a image, then looked at the size in inspector and realised the maximum is 707 pixels wide for a page (Fixer theme). Is this right?

So I attempted to delete it using the red x button, however it just shoots me up to the top of the page.

I could delete the image using the backspace key, but the floating red x button remains. Looks like a bug.

Please see screenshot.

Any ideas how I can get rid of this?

More worryingly when I view the page: http://webandglue.co.uk/service-fence-inner/

on a different browser (I'm not logged in), I see some ugly option boxes around the images. What are these? How to remove? Please see screenshot.

Thanks
Kevin