Original and amended return

Hello, my partner filed his original return without the 1095-A and some other 1099 forms (I think) as this was his first year on a marketplace health plan and investing. He has since filed an amended tax return and sent it by certified mail, and received confirmation of receipt from the IRS a few days ago. 

 

His original return was supposed to be about $1000 and when completing the amended tax return, TurboTax noted the refund difference (displayed on top left of the screen) was going to be ~$600. Does this mean his total refund will be ~$400 or are those the amounts he will be refunded per return, so ~$1600 total? 

 

His original return was accepted in early February and the estimated refund date was a month ago. Now the status bar on IRS Where's My Refund is gone and it just says it will be processed. The amended return status is not trackable yet. We're confused about what's happening with both returns as well, if they're both getting processed at the same time?

 

Anyways, we're just so lost with these two returns as we've never amended and neither of our returns have taken this long to process, so we're hoping to get some advice on this (we tried calling the local IRS as well and none of the options seemed to cover this subject). 

 

Many thanks in advance for your help!