Nether portals in Overworld all connect to same portal in Nether

error description

In any coordinate where Neder's portal is created in the overorld he always sends to an already active portal 

bug statistics

how it happens 

The bug happens when a new portal is created  in the overold 

Information about the bug

The bug causes any neder portal created in overorld to merge with an active portal in neder

Expected

Let a new portal be created 

Reality

Neder's portal merges with an active portal