You have two way switching and it sounds like wires have been swapped over. If you have a multimeter or a non-contact test pen it's easy to figure out what needs to go where.
Fixed, the grey wire in the above diagram had come away from the back of one of the switches. thanks!
@el_presidente started
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You have two way switching and it sounds like wires have been swapped over. If you have a multimeter or a non-contact test pen it's easy to figure out what needs to go where.