Checkout.com Lead Operations Engineer interview questions

After applying for a job on which I am a very strong match. I have never been given the chance of an interview at checkout.com After inquiry, I understood that someone at my current company gave a negative feedback. Before discarding a profile, my advice is to do a proper background search on someone. The best way is to ask multiple sources (not just a single source!) Also, question the fact that if I was that bad, why would my current employer give a bad feedback in an attempt to retain me ?