Hey,
I imported some of my onchain ethereum and xdai wallets and earlier this year i made some TWAP orders on cowswap, meaning periodically a trade was executed for the same trading pair (in this case gno and wsteth).
The way it imported it is:
I first send asset A to a specific address and then that address deposits asset B into my wallet.
Technically that is what happened, but obviously it is just a trade. Given it is a ton of these trades, any way to easily fix it. Merging the txn does no good unfortunately + I would have to merge each pair manually.
On top of it, a lot of the wsteth deposits have no cost basis if trade was on xdai chain. On ethereum it seems to find a cost basis.