Issue with product images

It looks like you have 2 separate issues here. I’ll address them one at a time

The Image Overlapping The Text
In your template you have 2 div elements side-by-side, The first one contains the images and the second one contains the text and add to cart button. Your problem is that the images div is 314px wide, but the image inside is 400px wide, so it overflows out of the container and on top of the text.

I don’t have experience with Jigoshop, but based on a little googling (look about half way down) it looks like you can change your image sizes. Try to find the images tab in your Jigoshop settings, look for an image width of 400 and try changing this to 314.

The Image Appearing In The Header
This is actually an intended feature in the Twenty Ten theme. If you upload a featured image that’s 940px or wide or more Twenty Ten will display this in the header of that post (you can see what it would normally look like here). You could try making a child theme with a modified header.php, but othewise the only thing I can suggest is making sure the images you upload are less than 940px wide.

Chris – you are an absolute star. Thank you so much! I can now sort the image sizes and dimensions and this will be sorted. I really appreciate you taking the time to help.