With this case, firstly please help me to OVERRIDE the link of your product again in Product List to update the inventory.
Then paste your product link in Ali Express to Override link section
After that, please go to Product settings under product list > turn on all the option in this section, also please choose option "Auto update" for few options > Save settings.
You will be updated for the next 2 days and every single 2 days, it will be automatically updated the inventory.
I hope this might be helpful for you if it doesn't work out with your situation.