Different CSS output between less compilers

For a while, I used to compile my less using Sublime's less2css plugin, but more recently I've started using LiveReload* and I love it.

I noticed a difference between the CSS output depending on the compiler I used.

For the following LESS:

.gallery { margin-bottom: 1em; img { .wide-gallery& { width: 49%; &:nth-child(odd) { margin-right: 2%; } } }}

LiveReload gave me the output I expected:

.gallery { margin-bottom: 1em;}.wide-gallery.gallery img { width: 49%;}.wide-gallery.gallery img:nth-child(odd) { margin-right: 2%;}

...but my less2css plugin in sublime mismatched my selectors:

.gallery { margin-bottom: 1em;}.wide-gallery .gallery img { width: 49%;}.wide-gallery .gallery img :nth-child(odd) { margin-right: 2%;}

Are the two compilers just using a different version of less? I'm not sure what's going on here.

*I'm using LiveReload v0.7.1.0 on Windows 8.

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