I think this is a K2 category issue (not anything to do with the template).
Go to your K2 Categories, select the Category that these items are under.
NOTE: If you've set this category to inherit properties from another category you'll need to go to THAT category.
In the Parameters, under the Category Item Layout set of parameters, have a look at your Leading, Primary and Secondary items options. If you only want to have two columns, make sure that you have 2 columns set for all three types of items. And make sure that the Image Size for XXXXX Items is the same.
From the images you uploaded, it looks like you just want to have a uniformed layout right down the page, no leading items, so set the number of Primary and Secondary count to 0 and number of Leading count to 10 (or however many you want to display on one page before the pagination). That way you only have to worry about setting the parameters under the Leading items.
Hope this makes sense. Let me know if this fixes your issue.
K2 is awesome. I've used it on multiple sites.