Added New Product Image But Not Correct Size; Highend Theme

I have Highend Themes ver. 1.5, WordPress ver 3.9.1 and if you go to my home page at KratomUsers.Com you’ll already will see the problem. The new added product pictures and category picture is out of proportion with the rest of the pictures. I don’t know why. I believe, I’ve seen this problem before with someone else and they were given a css code that could fix this to put in their Highend Themes -> General Settings and custom css. If someone could help please do. All my pictures need to be same size.