Well the saves might have been profile locked. They can be copied but will only work with the original profile.
As for your own file not working, I've no idea why that might happen. Maybe you'e messed up the profile recognition (or something) and it's treating your own save as foreign, the same way as the others.
Not sure what those links are for, but as two of them seem to refer to the Jailbreak then I've no intention of clicking on them. If those are the sort of sources you're getting saves from then you're bound to have (deserved) problems.
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