did you plant them yourself in the pots? if you bought them potted, it is possible, that the one that is dying doesn't have good root system... I couple times have found potted plants just stuck in the pot with half roots damaged or rotten.

It's probably just dry. At least in TX few people seem to be able to even keep bb alive much less fruit. Sometimes I think I'm one of those people.

Yes,I grew the sick one from when it was a baby,about two or three years ago.I repotted it last Spring of Fall.There was a lot of fruit last year. Brady

Then may be it is just dry? What kind of mix you used?... Watering containers could be tricky. Sometimes you pure half gallon of water and think you watered it well... But in fact water just when between pot and the soil-root ball and leave everything dry. Give it a good long watering, with slow flow... If it is over dry inside it will take long to wet it through.

It is Pine bark mulch and peat moss.
The thing is,I'm not the one who's doing their watering anymore.I have over twenty plants that are similar size and none of them look like that. Brady

Looks dry to me as well. I have found that when watering with a hose the water will just drain to the sides of the pots and not flow through the mix its self if not kept watered often enough. I have one 15 gallon Jewel doing that as we speak. I need to submerge it and let it rehydrate. Thats one of the problems with peat heavy mixes. Once it dries out it becomes hydrophobic and repels water instead of absorbing it. It needs to be hyrated quickly because its all down hill from here.

I would transfer to another larger pot and then mix 1/3 peat moss, 1/3 potting soil, and about 1/3 fine pine bark mulch and water well, but don't over water. They should grow like crazy!! Amazing what mine have done after following that approach!