Penny, it looks like a color temperature issue to me. And there are many things that could cause it. Since it happened when you added new light sources that is the first place to look.

If your old AB800 is more than 2 or 3 years old it may have a different UV rated flashtube. You could shoot each light bare to a Colorchecker to compare. In addition to introducing new light sources you have also introduced new modifiers. I'll bet the softboxes do not match in age/material/manufacturer/color temperature. The diffusion fabrics age, and maybe at different rates depending on usage (hot lights and hot modeling lights can affect them).

It is a good idea to label your lights so you'll be able to identify those two new lights and make it a point to use those as the two front lights where color temperature is most critical.