FTX Conversion Margin Borrows Giving 0 cost basis

Describe the problem:
Hello, I made several buys using FTX conversion that allowed me to margin borrow one asset to buy the other, the issue is my cost basis is 0 and that borrow transaction is giving a massive capital gain. I bought ETH buy borrowing BTC, so technically I would have a negative BTC balance at the time that I bought. Koinly cant find a prior purchase price for the transaction so its cost basis is 0 and is giving me very large capital gains when it shouldnt be.

Which exchange/wallet is this regarding?
FTX

How did you import data into this wallet?
Sync via API

What have you tried to fix this so far?
So far I have no idea what to do to solve this problem, as it seems to have occured with the margin borrowing transactions.

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