[Rails] weird SASS problrm in production

I have noticed a weird problem with SASS on production server.

in my application css I have:

pre {
  background-color: #eee;
  padding: 10px;
  font-size: 11px; }

div {
  &.field, &.actions {
    margin-bottom: 10px; } }


however firefox browser gets following CSS:

notice inserted a:hover that messes up my styling

pre {
    background-color: #EEEEEE;
    font-size: 11px;
    padding: 10px;
}
a {
    color: #000000;
}
a:visited {
    color: #666666;
}
a:hover {
    border-bottom: 1px solid #777777;
}
div.field, div.actions {
    margin-bottom: 10px;
}

when I try to override a:hover with my CSS it works fine on development machine but doesn't work on the production server.

How am I supposed to fix it?

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