What’s happening with my strawberries?

I purchased these strawberries at a Farmers Market. A few weeks ago, I was able to store them well enough to last all week. My method was to soak them for 3-5 minutes in a bath of 6 cups water, 3/4 cup vinegar, wait for them to dry, then lay them on a paper towel, lay a paper towel on top and add another layer of berries, and so on. (Detailed in this video https://youtu.be/PsYlbR0C16U?t=3m9s ) Finally, I place the lid on, and put the container in the fridge.

Lately I've been doing 3 cups water 1 cup vinegar instead because it is easier to remember, and I soak them for more like 5-8 minutes. Because I have such a high volume of strawberries, I pat them dry instead of waiting, and I dump each layer onto the paper towel instead of arranging them perfectly. This time I used ACV instead of white vinegar. I saw that the berries were a little moist, so after I let them sit in the container a few hours, I removed them and repeated the layering with new, dry paper towels.

I don't know if it's because I'm buying them in the summer heat and driving them home in a hot car, or if my vinegar portion is no good, but these berries are holding miserably. I bought these on Saturday and it's only Monday today. What are these moist spots? I've been cutting them off and tossing the okay bits in the freezer, but should I be tossing the berries? It's not mold, is it? Some of the berries look yellow on the inside, but I think they were like that when I bought them.

What am I doing wrong? I worked really hard to preserve two half-flats on Saturday, and it's hard to believe that these berries are already going bad. All that work for nothing. They really should be lasting longer than two days.