Thumbnail Image problem

Hello 🙂 I’m having problems with thumbnail sizes If you take a look here http://lovechildboudoir.com.gridhosted.co.uk/products-page/breeches_and_bloomers/dollhouse-damsel/ you can see that the plug-in is giving me various different thumbnail sizes.

Could some one help shed some light on what is happening and give a solution as to how to fix it please

Thank you and best wishes
Martin Black

http://wordpress.org/extend/plugins/microkids-related-posts/