My sourdough bread shrunk down when i did spooring
Hi, I have made my first sourdough using 20% self-made sd starter (7 days old), 75% hydration, 20% whole wheat and 80% ap, total flour 400gr. Bulk fermentation in the fridge for 10 hrs. Strech and fold for 6 times. The dough had risen up nicely and bubly but as soon as I put it in the hot dutch oven pot and did the spooring it shrunk down. My first thought was that the dutch oven was too small tjat the dough has no space to rise in the pot or the dough was overproof.
The bread still tastes really good but I am not satisfied with no oven spring. Can you let me know what is wrong with my dough? Thanks