I have encountered this problem before, and it is quite easy to solve it. Next, I'll tell you how to operate:

Tool: Apple 13, set 1.2.

Step 1: Click Settings and click Privacy. (as shown in the figure below)

Step 2: Click on exercise and fitness. (as shown in the figure below)

Step 3: Slide the slider to the right to open WeChat, then return to the WeChat sports page to refresh the leaderboard, and you can see the steps of the day. (as shown in the figure below)

The above is all the steps to solve the problem that the number of steps of WeChat movement is fixed. If it's useful to you, remember to like it for me ~