Sprite image load 3 times

[jellohouse]

I see in my browser's network tab that the sprite image src loads 3 times...

In some browsers it's no issue as the first download of the image gets cached and so 2nd and 3rd loadings are basically instantaneous.

However, in another browser I have, the image does not get cached. So it actually downloads the sprite image 3 times (and in my case it is a big file) which makes it slow.