This is a very common question that our students ask when making dumpling dough.
Obviously, there could simply be too much water for the amount of flour. You can avoid this problem by simply using the exact amounts of ingredients specified in the recipe.
Apart from that, there are other two common reasons that the dough will be too sticky: the dough was too warm when you started, or you're in a place with high humidity and temperature.
If you're noticing that your dough is too sticky, you need to use your own judgment to figure out the reason. If you think the dough is too warm, just allow it to rest for two to five minutes, and it will cool down naturally after a couple of minutes.
If you think the dough is too wet, then sprinkle a little flour on your hands, and gently knead the dough. If it still seems wet, repeat the same procedure..