If you give a flower and then hit the back arrow button it doesn't stay. But if give a flower then you click on Designs By Cuties link at the top right of the page it will stay. Or, click out of the post then give the flower but then don't go back a page again.
Sometimes if you refresh your page it will show up again if you clicked on your back arrow.
You can use "back to question list" and the flower will stay too. Just don't use your back arrow.