I’ve made tons of Kohakutou in the past but my last four batches keep either not sitting or crystallizing. What am I doing wrong?

After letting the agar agar sit in the cool mixture, I boil it for 5 minutes, then put the sugar in and boil for another 5. The recipe is 1/2 cup of water, 1 cup of water, 1 tsp of agar agar. I hadn’t made this in a few weeks but before it used to come out perfect 🙁

by sage_charms