These issues can be reproduced here:
1. Navigate to the above site on an iOS device (IPhone or IPad).
2. Touch the top right hamburger menu to open the Columns Display Form.
3. Touch a checkbox.
The first touch over a checkbox or its corresponding label is not changing the state of the checkbox but at the same time, the header buttons are switched to Done and Cancel (as if changes have been made).
Touching between separate column fields changes the state of the checkbox of the upper column but the same is not updating the header buttons (Back button remains visible and Done and Cancel remain hidden).
Video of reproduction - http://somup.com/crX0Q80F0j.