Opamp output

I want to get inverting and non inverting square wave at the same time. I am using EL2444 quad op amp, gain not required. My input is approx. 550 kHz, 50% duty cycle square wave. I assume that I will get the same output from non inverting op amp and inverted output from inverting op amp. But actually I am getting inverted output ok but non inverting output is differ, its duty factor was changed.

What should I do? Is there any problem in my circuit OR should I change op amp? Inverting output (yellow is input, blue is output)non inverting output (yellow is input blue is output)