The home I was inspecting was a flip. So tons of things wrong. One of the things I found was they tried to raise the floor so they lifted the joist and screwed the in with what appeared to be deck screws. Might be hard to see in the photos but I am uploading this from my phone. My recommendation was going to be that these joist were repaired incorrectly and since the joists are no longer supported by a beam an alternative method like joist hangers should be used. What are your thoughts. Am I overly concerned about these joists?
Yep, substandard repair. That gap between the subfloor and the rim joist is going to sag and bounce…maybe not a lot but it will eventually. The joist are not bearing and are relying on the sheer strength of the fasteners.
I am not sure how much of that I would describe, that will be up to you.
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That’s what you call a “hanger.” The floor is holding it up! 
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Yeap… they have it backwards. The floor is supporting the joist, instead of the other way around.
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Thank you for all the info.