Painting and Decaling

I have applied my decals to a formula one tamiya model I applied the decals to a gloss white body color, and covered with tamiya clear coat after a day or so I discovered the transperant portion of the decals turned yellow can anyone help as to what caused this I used tamiya gloss clear coat thinned with there lacquor thinner which i have had good luck with airbrushing so far and is there anyway to clear the decal up.