CSS supports multiple identical media queries, if you like, but CSS doesnt support nesting.
LESS, on the other hand, does support a few methods for nesting media queries. You can read about it here: http://lesscss.org/features/#extend-feature-scoping-extend-inside-media
Example:
@media screen { @media (min-width: 1023px) { .selector { color: blue; } } }
Compiles to:
@media screen and (min-width: 1023px) { .selector { color: blue; } }
LESS also supports nesting media queries below selectors like this:
footer { width: 100%; @media screen and (min-width: 1023px) { width: 768px; } }
Compiles to:
footer { width: 100%; } @media screen and (min-width: 1023px) { footer { width: 768px; } }
If this doesnt answer your question, then please post the relevant part of your LESS file(s).