Attachment body not loaded properly only for certain files

I’m having problem in getting attachment body properly in Skuid Page.

Steps to reproduce

• upload a attachment in salesforce. For example. upload this image… http://www.armeniapedia.org/images/6/65/GegoryIlluminatorStPietro.jpg
  ** - ** create a ‘Attachment’ model with id = ‘Attachment id’

Then, in dev console… i can see some /tmp/* path, not an actual base64 content. anyone face this problem ?