png display in ie

[pren]

I have some png format images created in photoshop with some transparency and shadows. I put them on my html page and applied some jquery transform (rotating them on hover). It works perfect in firefox but in ie after the rotation some parts (actually the original shadow parts) turn black and much bigger. Is it a jquery problem or my images? The strange thing is that at first they appear the way they should... I tried in ie9 and earlier versions.
Thanks for any help!

pren