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How to solve the responsive issues for the K2 images?

You can try this solution:

Please, add this codes inside the 

www.your-domain.com/templates/gantry/less/mediaqueries.less file:

.modal {position: relative; left:0px; top: 10px;}

So:

// Mobile Modes (line 121)
@media (max-width: 767px) { 
    .modal {position: relative; left:0px; top: 10px;}
    ...

Thank you very much,
Yours sincerely,