Updated :
I saw you've marked it as -10 volts ! but why such a behavior ? it is confusing ! and hardly i could see the minus sign .
Well , now try to redraw your circuit ! then we can judge about it !
By the way can you show us what you've took from out put ?
and another point is how you've selected values of that circuit ? randomly ? hat circuit has a formula . a standard formula which created some red boundaries . that if you obey them it will work as well . you can find it's formula everywhere in the google !