You have to update the text box string manually if you re-enter or edit the co-ordinates. I’m guessing, you initially entered 37,1822 * 121,5330 for your data which is in China.
When editing, you need to change the focus out of the lat/long boxes in order for the map to update (ie go into the accuracy box or something else) if you want the pin to move, as untill you do so, it is not saved yet, or alternatively hit the save button at the bottom.