about fake nails...

So I know this isn't the right spot to ask but I tried google and couldn't find any answers. Well I don't usually get fake nails, but mine are short and ugly because I bite them and my baby shower is tomorrow so I wanted them to look nice. Well I got the gel fake nails and I painted them all white, with glitter designs. Well I got it done yesterday and today the white on the nail is like changing color, it's like a tint of tan or red.  But does anyone know why the white is changing color like that? I just got them done yesterday so it's not like there a week old or anything.