shopamericatours.com/outlets-at-anthem/item/edit/101#k2Tab5
Editing the user profile works fine. But when editing Content, the "Save" and "Close" buttons do not seem to work.
I did make some changes to K2's Global Configuration, which may be the problem.

Joomla 3.5.1; K2 2.7.0

Private credentials available for those who offer to help.

Start by activating 3rd party K2 extensions, eg: the K2 Maps plugins you are using.

Another known plugin which causes issues with 2.7 is K2 Multiple Images.

If you mean to DEactivate various K2 plugins, I tried the Google maps component - to no avail.

Here is a screenshot of all the K2 related extensions... Do you see others there I should try?
i.imgur.com/amhNftQ.png

K2 Store will not cause this error if it is updated.
Are you using overrides for the itemform?
Use this post - getk2.org/documentation/tutorials/174-templating-with-k2-and-the-concepts-of-sub-templates - in order to locate the file.