Our long drape, lined curtains will not come together at the top and we have been unable to find a way of achieving this. We think that rather than using the cord someone has pulled them together violently and displaced something.
you need to take the curtains off the rail, and pull the cords and see that the problem is? could be something stuck in the track, its the best was to see that the problem is.
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Try fixfault.com to fix curtains.