What you want to ask is that it is normal to get thicker at first, and then get thinner. What is the reason? The reasons are as follows:

1. According to Kyushu Drunk Catering Network, the ratio of starch to water is wrong. When making thicken, if you put too little starch, the preheated thicken will start to be sticky, and it will return to its original appearance after heating for a while.

2. Cooking time is too long. After adding water starch to the soup, turn off the heat and serve. Boiling water starch for too long will lead to thickening and thinning.