Double declaration of .btn-default

[kequach]

Is there a reason why there are 2 different CSS specifications for the .btn-default class?

.btn-default {
	color: #333;
	background-color: #fff;
	border-color: #ccc
}
.btn-default {
	background-color: #f4f4f4;
	color: #444;
	border-color: #ddd
}

I found this in my generated CSS