When you connect one monitor, the other one turns off, or does not turn on at all?

Question

Monitors

Hello
, in general, I have one problem and I ask you to help me solve it.
I searched the internet but didn't find anything.
I have a computer with 3 graphics cards. they have the parameter "Number of monitors connected at the same time" = 3, that is, on these video cards you can connect a total of 9 monitors, without any problems.
As for monitors, I have 11 and all are good, and I want to connect 9 pieces.

and the problem is this:
1) I can barely connect only 6-7 more of it, the fact is that when I connect all 9, then 3-4 of them are black in the "screen settings".
2) for example, I connected two monitors on the first video card, and I connect the third one, the following happens: one of the monitors goes out and this one turns on, or it is shown as a black screen in the "screen settings".
these black monitors do not expand and they write an error saying that it is impossible to save nicknames.
because of these problems, I can't connect all 9 monitors. I've been trying for several days now, tried everything that came to mind, even reinstalled Windows several times with all monitors turned on and not.
here is another diagram according to which I currently have 6 monitors connected and they work:

nevertheless, I think that the problem lies in the program, because when I connect all the monitors and only a few are turned on, I can turn off one of the ones that are turned on and only then turn on 1 of which did not turn on
please help me figure this out.
thanks in advance.
Computer configuration:
Operating system: Windows 7 Professional x64
Processor: Indel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Motherboard: Asus Maximus VII Formula
Video card: AMD Radeon R9 270 (3 pieces)
RAM: 16 GB