Hmmm....it looks like a spicebush, palamedes, or black swallowtail egg, but they don't use passionvines! If it were sort of elongated, it could be a variegated frit egg, but since it's round that can't be it.
Maybe somebody else will know.
MissSherry

Thanks for trying MissSherry. I am debating if I should remove them or wait a little longer just to see what happens...

Does anybody have an idea what those are?

Leonora.

Leonora, are your passi's located near another host plant? Sometimes butterflies do lay eggs near the host plant but not "on" the host plant, depending on the species of butterfly.

Susan