Tried to start a nether hub and I have created portals in the right coordinates both in the overworld and nether, but each portal exits from the main nether portal not the one you are trying to link. I have broke and reset the portals multiple times but the issue keeps occurring.
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duplicates
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Also, what's the seed of your world?
Seed: -8958892888425257600
Main Overworld Portal: -110 69 209
Main Nether Portal: -4 57 18
Overworld Portal 1: -252 167 174
Nether Portal 1: -32 52 22
If I enter Overworld Portal 1, it takes me to the Main Nether Portal instead of Nether Portal 1. Re-entering the Main Nether Portal takes me to the Main Overworld Portal. Hope this clears up any confusion you may have. Thank you.
I'm not sure if this affects it, but the Z Coordinate for the Main Overworld portal (209) is closer to 22 (Nether Portal 1) than 18 (Main Nether Portal). Also, though I believe Y Coordinates don't matter as much as X and Z, the Y coordinate for the Overworld Portal 1 (167) is closer to 57 (Main Nether Portal) than 52 (Nether Portal 1).
I don't have too much knowledge on Nether Portal linking, but these coordinate 'differences' may very well be affecting your linking.
I think something is very wrong with the nether portal linking.
Maybe you issue is related to MC-149705

Duplicate of MC-149705
What are the coordinates of the portals, both in the overworld and in the nether?