The difference between opal and chin is on the C loci. Opal is completely dominant, and chin is a recessive. So only one of those genes can be expressed.
Wendy, I hate to make this suggestion, but I would probably cull rabbits related to these weird coats. If they molt out to be "normal" in the end, that's all well and good for showing, but it doesn't really strengthen your line. You'll be dealing with these uncertainties for generations into the future. Having to "dump" a portion of your foundation stock would stink (big time), BUT having to trash a whole line down the road would be even more frustrating.
I know agouti colors sometimes develop in odd ways, but this is particularly strange and seems to take a long time to molt out! So just "dealing with it" means keeping kits for quite awhile before being able to offer them as show/brood. Color isn't the biggest concern in the world, but when something funky pops up it's worth watching. And when the same funky pops up a generation later, it's time to consider making a change in the program (in my opinion, anyway). :-/