Code for 2 ultrasonic sensors
You are trying to measure with 2 ultrasonic sensors at once. You cannot do that so easily. You need to measure sequentially for 2 reasons:

The ultrasonic sensors might get confused by the others signal
You will miss the pulse of the one sensor, while you are reading the pulse of the other via pulseIn().

So the order of actions is like this:

Trigger sensor 1
Read sensor 1 with pulseIn()
Trigger sensor 2
Read sensor 2 with pulseIn()