You probably need to add a few more seeds. This can happen if your proportions are off, or with old chia seeds or apparently certain brands. Just add about a teaspoon more, stir and then wait. You should wait at least an hour to give the seeds time to absorb the liquid. True confession: I’ve tried this at the 30-minute mark, as hunger was about to take over. The seeds were maybe a little crunchier than usual, but other than that I noticed no difference.