you're likely to get more help on the fruit forum.

Is there a reason they can't be planted in the ground? Depending on type, many blueberries grow into quite large shrubs - 6+ feet. If left in containers, you can either store for winter in the garage (as long as it doesn't get much above 40F) or sink the pots in the ground. Or if your zone is at least a 7, you can just leave as is outdoors.

Different cultivars of blueberries have different harvest times and once that period is past for the season, no more fruit production. It sounds like the one that is no longer producing is an early season blueberry and it is just at the end of its fruit production for the season. I generally suggest to clients to select an early, a midseason and a late season bush to maximize the length of their harvest, as no single type (with a couple of minor exceptions) will fruit all summer. And there is enough of an overlap of bloom times to achieve good cross pollination.

Thank you i believe we are zone 6. We have a very large deer population and if i ground plant them that would mean i would have to do fencing and all the other protective methods. They eat everything. Thank you for the response

Yes, you would most certainly need to protect them, and almost certainly you would have to lower the Ph of the soil where you grow them. They require an extremely acid soil--below 5.5.

From experience I can tell you that I have acidic sandy soil, about 6.4 and my blueberries struggled for 3 or 4 years until I lowered the Ph to 5.5. Now, many years later, my 3 heavily mulched plants produce a prodigious amount of berries.