Just went and dug through my account and found they were just back charging me for the earlier shipment.

On 3/5 they charged me $154.83, which I saw go through then and thought I was done.
Then on 3/10 they charged me $72.70 for the Gen2's and shipped them. They arrived a few days later.
About a week after that I received the Gen3's.
Then out of the blue on 4/18 they charged me $83.93.

After digging through my account I found that they had refunded the original charge of $154.83. So in the end I did get charged the correct amount, it was just weird they came back almost a month after I had received them to charge me for the gen3's.