Strange icon scaling

[cross-orbit]

Sometimes when loading the page, especially when loading it for the first time (clear cache) this happens:

Some, sometimes all of the moving icons scale in a strange way. Tried to fix this myself but cant get it to work differently... My fix for now is using a smaller icon so it wont be that noticable, but its not the solution.

Any Idea what the problem could be? When reloading the page, everything works normal and it doesnt happen anymore, untill you completely reload the page.

Thanks!