Pigment Swirls in Resin Cause Resin Not to Cure

Hello, I have had this problem twice now and I was hoping someone would be able to help me out. I am trying to make dice, and currently am trying to make clear dice with pigmented swirls inside of them. I mixed the resin, poured the clear resin in the mold first and then mixed bronze powder pigment in with the remaining resin. I dropped some in and swirled it inside the clear resin. I had some leftover so I poured the remaining pigmented resin into two other mold. Check them yesterday, a day after having poured them, the two pigmented ones were far along in the curing process, the tops having hardened. However, the mold with the swirls has not solidified at all.

I want to fix this and was hoping somebody would know what I’m doing wrong. If anyone can point me in the right direction I would greatly appreciate it!