Checkbox does not mark until clicking away

[CRHAAG]

I am working with an XLSM document in which I have a number of check boxes which are used to choose reports to run. On my machine everything works fine. Another person just tried using the file for the first time though and we have found a couple of anomolies:

1 - He has to double click the boxes for them to change status
2 - after double clicking, the box does not change to checked or unchecked until he clicks into a cell on the sheet

On my machine I simply click the box once and the check mark changes. I'm stumped.

 

[CRHAAG]

Just an update on this:

I tried opening the file on my personal computer as well to see if the issue was isolated to a single machine. I did not have to double click the boxes and then click away to activate them. However, when I activated a checkbox, the text size would enlarge and become blurry.