.....01A is NuFlex self leveling silicone. ...02a is silicone, probably also NuFlex.
Silicone won't stick to itself, nor will anything else,
If you are having problems, the best thing to do probably is remove ALL of it, including under the skylight if it was glued down to that as well.
If it were me, I would then replace the skylight with butyl tape between it and the roof, and then use self leveling Dicor rather than silicone of any sort to seal the edges and screw heads. That's what I've done to all my old and new roof penetrations.
Others here may disagree with me.