Is Omni calculator correct? as a combined gas law calculator

Suppose an adiabatic expansion(W2) occurs and then an adiabatic compression(W1) is done to bring it back to its initial volume. In Omni calculator (combined gas law calculator) I saw that W2>W1 for some cases (eg. nitrogen of 1atm at 300K in 15 $m^{3}$ container expand to 30 $m^{3}$ case) But if that is true, then after expansion and compression if we introduce a hot reservoir we can run the process in cycle. In each cycle the work output is W2-W1 and what is more interesting is that we don't need a cold reservoir here. Or in other words it is a perpetual motion machine of 2nd kind. Please do help me solve this doubt. I also don't understand (if Omni is right) why the compression yielded less work. For helium case i didn't see this problem( which is a near approximation for ideal gas). Surely ideal gas don't do such things.

#Mechanics

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$