Painting garage in two parts with the exact same paint, but the second part came out grayer and not glossy at all

Question

I really don't know what happened or what messed up. This is the sequence of events:

• Due to time constraints and bad weather we had to paint in two different days for a garage wall & ceiling paint. We aimed for temperatures around ~65 degrees F as that was the best our city was getting in the next few weeks.
• We divided the garage in half and painted one half of it the first day and the other half the second day.
• On the first day (to paint the first half of the garage) we waited for the weather outside to be around ~65 F before starting the job. We applied primer as usual, waited for it to dry for 4 hours, then applied a 1st coat of paint. After this coat of paint dried the color came out just as we had purchased the color -- Glossy, and White.
• On the second day (to paint the other half of the garage), the temperature outside differed from the predicted forecast, so we had to paint at around ~60 F. We applied primer as usual, waited for it to dry for 4 hours, then applied a 1st coat of paint. This paint came out much more grayer, and the finish wasn't glossy but rough, like the texture of drywall.

In both jobs we used the same exact primer and the same 1st coat of paint, yet the colors and textures came out wildly uneven between each half of the garage. We made sure to use new rollers in-between days, and tried to keep the temperature while painting consistent for consistent coverage.

Trying to figure out what went wrong...

EDIT: I am a S-class graded idiot. I mistakenly swapped the use of the primer and 1st coat and didn't even check the label when both buckets of paint were similar colors. Dummy mistake

Answer 1

All of the comments are spot on but without knowing exactly what kind of coating,i.e. the primer and finish, it's hard to say for sure.

Was it an acrylic, water-based floor coating? Was it a solvent-based coating?

Was it epoxy and if so, waterborne, polyamide, polyamine, aliphatic urethane?

Polyamines are very sensitive to moisture.

Moisture and temperature variances are usually the cause of what you described.

I am a General Manager at a local retail paint store for 21 years and these are the questions I would ask my customer.

Edit: To answer your question below: Yes, adding a final coat of the correct finish will help. In some cases the floor where the mistake needs to be stripped to the concrete. Hopefully, a final coat will fix it.