I have several capital ships that are shown to be the gravity well of a blue star, but when I zoom in they are not there. I highlight the ship on the left pane they report if I try and give movement instructions their green path extends out of the stars gravity well into the blackness I assume is out of play area but they do not come back into the gravity well so I can use them.

One ship has captured enemy Advent ships, I'm wondering could this be an ability of the Advent, to send ships out of play??