When bsv forked off from bch, it didn’t add replay protection. What this means is that, any transaction created in one blockchain, would be mirrored in the order. In order to prevent this from constantly happening, you’ll have to split the bsv from the bch before you can use it properly.
This is even more technical, how does a layman split this himself? what I understand then was that some wallet and exchanges supported this split while some were supporting BCHABC.
You probably should ask bch community here:
https://memo.cash/all. That is where you will likely get a quick and satisfactory answer. Rickorick gave you a good answer, I think.
You should check out their community if you want the technical aspect answered to your sanctification:
https://memo.cash/all