Completely agree. Those options are definitely not functioning because I did the exact same thing. Pretty much before even playing the game I made sure all those were unchecked, but spells kept coming and going regardless.
I've noticed that spells who can be reapplied or recast (Speak with dead, Eldritch Blast, True Strike etc) have a tendency to disappear and reappear at random intervals. I haven't paid enough attention to them, but I think it's tied to the spells' availability resetting when you rest.
It's very annoying and I sincerely hope they address this before the full release of the game. I'm unsure why it's even necessary for the recast options to produce a second spell slot at all, it'd be much easier if I could just continue using the same ability.