I originally bought AGI on Binance which later went to AGIX. I now see double the amount I actually have on Koinly.
I linked my Binance exchange to Koinly. I did not import a csv
I have synced the Binance account several times.
I have just downloaded all the data from Binance now in the form of 3 csv files to my pc. So if needed could delete my Binance exchange on Koinly and then upload again.
Koinly will handle this migration automatically and convert all of your AGI to AGIX. This creates a small issue since Binance will also report an airdrop of the new AGIX which then doubles your holdings.
Fixing this is very easy since you only need to delete this new airdrop transaction as it is not necessary
See more here: https://help.koinly.io/en/articles/4928719-rebases-swaps-ampl-dot-ocean-etc