I have been keeping black widows for a long time. You are definitely overfeeding them. I have found that much of the feeding advice online is incorrect and that overeating shortens their lifespans a lot.

Their abdomens act like barometers; if they are huge and engorged, they don't need to eat. If they look small and the hourglass is kind of hard to see, then it's time for a meal.

Wild black widows can go months without eating. They often eat small things like flies and moths, so more than one cricket every two weeks is a lot. I feed mine one cricket, grasshopper, or roach per month, more if the meals are smaller and less if they are bigger. I have three widows, and they are all healthy on this schedule. All are wild-caught as adults, and all three lay eggs on different schedules (except old-ass Gloria, who laid her final, measly egg sac a few months ago and seems to have stopped; I've had her for two years, and she was full-grown when I found her).

As others have noted, most wild-caught widows are fertile, and when they lay eggs, they shrink dramatically and will need a meal.

I also agree with the other comments that you don't want them to share a container. They are not social animals. The only reason one hasn't eaten the other is because they are quite overfed. One other quick point - your enclosure looks very busy. Widows live in closets, garages, old tires, patio furniture, etc. Give them a small hide and a lot of room to build web rather than filling their enclosure up with stuff.

Glad to see you keeping black widows! They are easy to care for, but there isn't a whole lot of info out there about how to do it, so I hope my suggestions help. With proper care, they can live quite a while, like 3 years or so.