unselectable sim

I used a pre-built household from the gallery and edited some parts of them. When I went to move them into a lot it only showed 7 out of the 8 as selectable characters but showed all 8 there. It would let my other sims interact with that sim, but it wouldn't let me play as that sim. As soon as I hit play that same sim aged up as soon as it started. I even closed the game without saving anything and re-opened it and tried placing the same household down only for it to do the exact thing. I even evicted them from that lot and then it kicked that sim from the household without notifying me. Is this a bug or am I doing something wrong?