Connected Computer Screen is Weird Ratio

I have several computers and I often connect to one of them from another computer. Unfortunately, the screen shown by one ot the computers has as strange ratio. The screen is supposed to be 16 wide by 9 long. On this computer, the screen appears to be 4 3/8 wide by 6 long (35 x 48).and it is pinched. This sqeezing is not true when I connect with other computers. Any ideas?