I didn't make it!
I just installed BC again after watching 2 seasons of TNG in a marathon...
And well, after installing the official patch, I installed USS Salem's DBridge enhanced textures and swapped Saffi's face for Haleys. I also used bridge positions swap to get people on the right places, which means the .pyc files of bridge personnel changed.
At first, commander Graff while being on the viewscreen had some sort of flicker in his head, and after a while I noticed he had 2 heads in different animation sequence...
Everything was fine before the addons though.
I will uninstall and re-install, doing the changes gradually to determine which causes the problem but I find it intriguing that only the people appearing on viewscreen are affected by it, not the bridge personnel.
before installing mods copy all graffs head info to another place..en put it back when finnished installing mods!!