Banner Ad location sizes?

Hi Guys,

I trust you are all keeping well.

I have an issue with stacking of my banner ad’s when page loads. This occurs for a split second and then ok and the banner location starts to rotate as it should. Both on desktop and Mobile devices accross multiple browsers Ive tested. There is only 2 ads in the group location at present, the worry is when I add some more!

This stacking of ads doesn’t occur in the header location though! Only on the sidebar and in-post locations?

Could this be a pixel dimension size of the banner ads Ive created? .. is there a specific size guide to design to for desktop and mobile?.. for instance the size Ive created the sidebar ads are 600 x 500 pixels.

I am using AdRotate plugin which you mention in your site documentation. Their support has not been helpful in solving this issue I’m afraid.

Please see this example of a page. Thank you.

https://www.ircatoday.com/broadditch-farm-shop/

Kind Regards

Mark