Sprite PNG is appearing distorted

We are using a png/8 sprite on a client's website. He is reporting the image is appearing distorted for him and on other computers on the company.

Here's how it should look:

http://ift.tt/1GPElQK

And here is the print screen the client sent us:

http://ift.tt/1aqVgwL

I have tried donloading and exporting it again, uploading again. The problem is: On our computers it looks fine, so it's hard to test it. Our client is viewing it in IE: 11 and Google chrome: 41.0.272.118.

Has anyone seen this type of error before?