Index: src/bp-xprofile/bp-xprofile-classes.php
===================================================================
--- src/bp-xprofile/bp-xprofile-classes.php
+++ src/bp-xprofile/bp-xprofile-classes.php
@@ -387,8 +387,12 @@
 	public static function update_position( $field_group_id, $position ) {
 		global $wpdb, $bp;
 
-		if ( !is_numeric( $position ) )
+		if ( !is_numeric( $position ) ) {
 			return false;
+		}
+
+		// purge profile field group cache
+		wp_cache_delete( 'xprofile_groups_inc_empty', 'bp' );
 
 		return $wpdb->query( $wpdb->prepare( "UPDATE {$bp->profile->table_name_groups} SET group_order = %d WHERE id = %d", $position, $field_group_id ) );
 	}
Index: tests/phpunit/testcases/xprofile/functions.php
===================================================================
--- tests/phpunit/testcases/xprofile/functions.php
+++ tests/phpunit/testcases/xprofile/functions.php
@@ -614,4 +614,27 @@
 
 		$this->assertEquals( 5, $field->option_order );
 	}
+
+	/**
+	 * @group xprofile_update_field_group_position
+	 * @group bp_profile_get_field_groups
+	 */
+	public function test_bp_profile_get_field_groups_update_position() {
+		$g1 = $this->factory->xprofile_group->create();
+		$g2 = $this->factory->xprofile_group->create();
+		$g3 = $this->factory->xprofile_group->create();
+
+		// prime the cache
+		bp_profile_get_field_groups();
+
+		// switch the field group positions for the last two groups
+		xprofile_update_field_group_position( $g2, 3 );
+		xprofile_update_field_group_position( $g3, 2 );
+
+		// now refetch field groups
+		$field_groups = bp_profile_get_field_groups();
+
+		// assert!
+		$this->assertEquals( array( 1, $g1, $g3, $g2 ), wp_list_pluck( $field_groups, 'id' ) );
+	}
 }