First of, there's a typo: "Molecular fabricatorc", there's an extra 'c' that does not belong there.
Second, both structures have the same graphics and similar bonus to research, manufacturing and population. One is +2 to all, the other +3. Both says "colony unique".
Are they the one and the same? One being the improved building? If that is so, then it's a bug that I can build it twice. If not, it's a bug they share the graphic and similar bonus...