You can't sample that swatch with Corona picker because of afforementioned rounding issue, so you have to download it to photoshop and read sRGB values there. Swatches with higher values, can be picked with Corona picker directly.
Edit: i think it would be best if dubcat would write sRGB values next to each slot, so it could be useful even for people who doesn't use Corona picker, or doesn't have second monitor or are too confused in which mode to sample colours (sRGB or RGB).