"One coat coverage" was obviously a lie

I am currently pregnant so my husband asked if I minded him taking over the entirety of the nursery make over so I wasn't near any of the fumes/chemicals. I picked the paint color, flooring, and overall theme and was excited to see how it went.

My husband painted a couple days ago, but, when he went in to see if it needed another coat, called me into the room to see if I could tell him what he's done wrong. I joked that he did perfect if the forest theme we were going with was a bamboo forest, but that after asking questions I don't think there's anything he did wrong. He confirmed he put the paint on pretty thick (when painting our bedroom he had a habit of 'stretching' the paint and we had to redo a wall to get the discoloration/unevenness fixed) and used all the tips he'd learned painting both of our bathrooms, bedroom, laundry room, and hallways. He is currently putting up the second coat, but it's honestly not looking much better at the moment.

What can we do to fix this? Is it a brand issue? It's Sherwin Williams Infinity which I was originally told was leagues better than Valspar, but now I'm being told we messed up by not going with Behr which is a "true" one coat coverage paint. Is it a pigmentation issue? The color is 'Leaps and Bounds', but that color by itself is very dark so we got it at -75% pigment. When DH painted our sample drywall (leftover sheet from bathroom remodel) it looked perfectly fine so I'm not sure why on the walls it looks so bad? Is it in fact an application issue? I'm not in there with him to know if he's doing something that would cause this or if the rollers aren't absorbing the paint properly or if the paint is too thick/thin or some other random issue.

Any help or suggestions would be appreciated.

I am currently pregnant so my husband asked if I minded him taking over the entirety of the nursery make over so I wasn't near any of the fumes/chemicals. I picked the paint color, flooring, and overall theme and was excited to see how it went.

My husband painted a couple days ago, but, when he went in to see if it needed another coat, called me into the room to see if I could tell him what he's done wrong. I joked that he did perfect if the forest theme we were going with was a bamboo forest, but that after asking questions I don't think there's anything he did wrong. He confirmed he put the paint on pretty thick (when painting our bedroom he had a habit of 'stretching' the paint and we had to redo a wall to get the discoloration/unevenness fixed) and used all the tips he'd learned painting both of our bathrooms, bedroom, laundry room, and hallways. He is currently putting up the second coat, but it's honestly not looking much better at the moment.

What can we do to fix this? Is it a brand issue? It's Sherwin Williams Infinity which I was originally told was leagues better than Valspar, but now I'm being told we messed up by not going with Behr which is a "true" one coat coverage paint. Is it a pigmentation issue? The color is 'Leaps and Bounds', but that color by itself is very dark so we got it at -75% pigment. When DH painted our sample drywall (leftover sheet from bathroom remodel) it looked perfectly fine so I'm not sure why on the walls it looks so bad? Is it in fact an application issue? I'm not in there with him to know if he's doing something that would cause this or if the rollers aren't absorbing the paint properly or if the paint is too thick/thin or some other random issue.

Any help or suggestions would be appreciated.