Rotation of scrollview paging issues

[Wilsones]

Hi i am relatively new to development and i am currently having trouble with autorotation of a scrollview currently being used for an image gallery.
The scrollview frame is set to the screen bounds, paging is enabled and in both orientations the scroll view orients correctly and scrolls the way it should.

However, when i change the orientation when on a middle page, the screen changes orientation but the scrollview either is stuck between pages or flicks to a different page.
The scroll view paging however, works as normal when scrolled from these positions.

I just dont know how to make it so when the orientation changes, the page currently being viewed is displayed correctly from the start.

Thank you for any help