HELP! DIY Candles (Soy and Gel) did not cool properly.?

Hi, I recently started making DIY candles (soy and gel) and came upon some issues once the candles cooled and set. The gel candle (https://imgur.com/jiRCL55) cooled completely foggy and you cannot see any of the details inside. What caused this? How can I avoid this? All I have in the candle as props are some... show more Hi, I recently started making DIY candles (soy and gel) and came upon some issues once the candles cooled and set.

The gel candle (https://imgur.com/jiRCL55) cooled completely foggy and you cannot see any of the details inside. What caused this? How can I avoid this? All I have in the candle as props are some marbles and a washed sea shell.

The soy candle in mason jars (https://imgur.com/gZPyGvD & https://imgur.com/cmQEoNo) cooled completely and appears two-toned. It almost looks like some wax is cooled to the outer/inner shells of the mason jar if that makes sense. Also, two of my candles cracked at the bottom. What caused this and how can I avoid it? The candle consists of soy wax, fragrance oil and colorant made for candles. TIA!