Dragynfyre: Also another bug I've noticed in the game is that in conversations where you can use persuasion, intimidation, or Axii sign hex you can repeatedly use the same persuasion, etc. speech option as many times as you want if you fail the check the first time. I'm not sure if this was intended or not but it definitely defeats the point of having those checks in the first place. The persuasion, etc. speech option should be removed after failing the check.
I don't know about your problem with deleting save games, but what you describe here does not apply to every conversation. In fact, most of these checks you only have one chance to do, and the option is then removed (or the conversation advances to a point where you can't make the same dialogue choice again). I suppose there could be more out there that allow you to try an infinite amount of times that I haven't seen, but I seem to recall there are more of those who don't. Either way, I can only assume it's not working as intended, but who knows? I second your request to make all of them non-repeatable.