Glad you got this worked out, I was about to tell you to look for a filter that was altering the post slug as soon as I read this.
– When creating new fields (any field, not just a repeater) the key will change from the field_xxxxxxxxxxxxxx format to be the same as the name i.e short-description.
and then I scrolled down to see that you’d solved it.
My main reason for posting is to say thank you for the way you posted your problem. If you hadn’t solved this problem yourself the amount of detail you gave made it extremely easy to narrow down what the underlying issue was.
