I opened a nether portal in survival at coordinates 1010, 810.

That took me to approximately  125, 100 on the nether.

The issue I have is when I when to 1432, 1298 in the overworld and built a nether portal, I was connected with the one at 125, 100 and not a new one at 179, 162. The same thing happened when I went to 1650, 1485 and built another one. 

If I go to the corresponding location in the nether and build a portal I will emerge at the one I built at the new location.