Index: wp-admin/js/theme.js
===================================================================
--- wp-admin/js/theme.js	(revision 27897)
+++ wp-admin/js/theme.js	(working copy)
@@ -229,6 +229,10 @@
 			self = this,
 			query, isPaginated, count;
 
+		// Store current query request args
+		// for later use with the event `theme:end`
+		this.currentQuery.request = request;
+
 		// Search the query cache for matches.
 		query = _.find( queries, function( query ) {
 			return _.isEqual( query.request, request );
@@ -244,7 +248,7 @@
 		}
 
 		// Otherwise, send a new API call and add it to the cache.
-		if ( ! query ) {
+		if ( ! query && ! isPaginated ) {
 			query = this.apiCall( request ).done( function( data ) {
 				// Update the collection with the queried data.
 				self.reset( data.themes );
@@ -305,9 +309,6 @@
 
 	// Send Ajax POST request to api.wordpress.org/themes
 	apiCall: function( request, paginated ) {
-		// Store current query request args
-		// for later use with the event `theme:end`
-		this.currentQuery.request = request;
 
 		// Ajax request to .org API
 		return $.ajax({
@@ -1143,6 +1144,9 @@
 			request.tag = [ value.slice( 4 ) ];
 		}
 
+		$( '.theme-section.current' ).removeClass( 'current' );
+		$( 'body' ).removeClass( 'more-filters-opened filters-applied' );
+
 		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
 		// or searching the local cache
 		this.collection.query( request );
@@ -1297,6 +1301,7 @@
 		}
 
 		$( 'body' ).addClass( 'filters-applied' );
+		$( '.theme-section.current' ).removeClass( 'current' );
 		filteringBy.empty();
 
 		_.each( tags, function( tag ) {