Wrong cost basis/gain on USDC coinbase

Describe the problem:
I transfer 2163,47 USD to coinbase
I pay $2,163.47 USDC with my coinbase debit card
The “cost basis” for this transaction was $1,163.22.
So the “gain” was $1,000.25
That’s wrong because USDC is a stablecoin. There is no “gain” ,
How can I adjust the cost basis ??
Which exchange/wallet is this regarding?
coinbase

How did you import data into this wallet?
API

What have you tried to fix this so far?
I created a manual transaction and soft deleted the old one but still the gan keep in 1000.25

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