Facebook has to "look into it" before doing or saying anything. Nothing nuts about it. I imagine that the German staff were given admin access because FB didn't realise the two were separate companies but selling the same kind of products. The US Merck could sue FB for that, if that is the case.
Given that so many companies have the same name in different countries, (in Australia, you can have the same business name in each state) I am surprised that FB staff aren't aware of that.