Coinbase API missed fee

I’ve successfully synced Coinbase through the API on numerous transactions. However, today, on one of my Ethereum purchases (USD/ETH) the fee was not included. I made the same USD/ETH purchase two days ago and it synced over just fine. I also made a USD/BTC purchase on the same day/time (today) as the ETH that is missing the fee. The USD/BTC done at the same time synced the fee ok. It causes me to worry about the integrity of the import process. Any ideas why it worked once and not the other? I’d like to gain peace of mind that I can just let it do its thing and trust all is correct for when I start doing 100s of transactions per month.