I would email Nubar. This doesn't seem normal to me. Mine is white too.
OMG that totally happened to me! I bought two bottles of Nu Nails from Lotion Source and they were yellow! It doesn't seem to be doing any damage, but I'm VERY CURIOUS about why it's yellow when every one I've ever had before was white.
I just emailed Nubar asking about this. Hopefully, I'll get an answer soon!