story assigned for 2 sprints

Hi,

i managed to assign multiple stories to 2 sprints.

What i did was do click the "move all incomplete stories.." button and moved all stories from sprint 13 in my backlog to sprint 14.
Then i added other stories to sprint 13.

All looked fine so far, then i saw the calculation of the sprint where very high numbers was shown. I did an refresh of the page and then i saw all of the "old" stories still in that sprint plus the new ones.
In sprint 14 there are the same stories planned, so i have multiple stories assigned to 2 sprints.

In Backlog view they are shown as assigned to sprint 13.

i let that mess until tomorrow that u can take a look at this but then i have to clean up the backlog.

Backlog ID is 4296.