If you make a nether portal, enter it and get it destroyed, when you make a new one enter the portal to the normal world and go into the old nether portal, a new portal will appear.
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When you enter a portal, it searches the destination chunk for a matching portal. If it does not find one, it creates one. This is working as intended. There are ways it could be designed to avoid this, but they tend to be pretty inconvenient for the player. It's not like there's any shortage of lava or obsidian – the real cost is the time it takes to break the block to pick it up, and the wear on your diamond pick to do so.
this isnt a bug, the mechanics are designed to do that. I dont know the math but when you make a new portal in the nether and the multiply x*8 y*1 and z*8 then it will go to that exact (or closest) in the normal world