Players in Survival Mode wouldn't get right coordinates while travelling between Overworld and the Nether.

I tested for several times, travelling between Overworld and Nether but still I can't get the right coordinates. For example, when I go into Nether at (80,80) Overworld, I shall arrive at about (10,10) Nether, but when I get in I found myself at (80,80). However, if I do the same in creative mode, this issue would not happen.