nether bug

When I went throu a nether portal the first time in my hardcore world, it was on 1.16 snapshot, i got spawned i the nether. Later i destroyed that portal, moved about 1000 block in each direction and built a permanent base. When i built a new nether portal and went throu it, it spawned me in my old nether portall in the nether. When i tryed going back throu the nether portal, it spawned me at my old base. i tried this in creative also, and it is consistant. Hope you will fix it soon.