K2 image article and bootstrap

Since i hade installed bootstrap i have problems with the image for k2 articles. All the k2 images for aticles, when i click on the article to show the article from a specific category, the image pops up and is huge. Before bootstrap that was not happened.
I deleted all that images, and i insert the image into the article content. Now, this is ok regardin the k2 articles, but, on front page, on news, the articles remained without images, because the newsprogk ask for that image.

How can i fix that problem in K2 article.
See a pop up image for k2 articles.

popup.jpg

Hi

Please tell me the url to the exact page I will be able to see an example of this problem.