diff --git a/FSCalendar/FSCalendar.m b/FSCalendar/FSCalendar.m
index d4b6ec4..0de3ef0 100644
--- a/FSCalendar/FSCalendar.m
+++ b/FSCalendar/FSCalendar.m
@@ -650,7 +650,7 @@
     _needsAdjustingMonthPosition = YES;
     _needsAdjustingTextSize = YES;
     [_collectionViewLayout invalidateLayout]; // Necessary in Swift. Anyone can tell why?
-    
+    [_stickyHeaderMapTable.dictionaryRepresentation.allValues setValue:@YES forKey:@"needsAdjustingFrames"];
     _preferedWeekdayHeight = FSCalendarAutomaticDimension;
     _preferedRowHeight = FSCalendarAutomaticDimension;
     _preferedHeaderHeight = FSCalendarAutomaticDimension;
diff --git a/FSCalendar/FSCalendarCollectionView.m b/FSCalendar/FSCalendarCollectionView.m
index c309a5a..7d79462 100644
--- a/FSCalendar/FSCalendarCollectionView.m
+++ b/FSCalendar/FSCalendarCollectionView.m
@@ -12,6 +12,16 @@
 
 @synthesize scrollsToTop = _scrollsToTop, contentInset = _contentInset;
 
+- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout
+{
+    self = [super initWithFrame:frame collectionViewLayout:layout];
+    if (self) {
+        self.scrollsToTop = NO;
+        self.contentInset = UIEdgeInsetsZero;
+    }
+    return self;
+}
+
 - (instancetype)initWithFrame:(CGRect)frame
 {
     self = [super initWithFrame:frame];