Thanks.
No, I am on fiverr since 2017 and I knew about violations. I asked them what was the issue. They didn't mentioned anything and just sent a formal message.
Looks like an issue from their side because I tried to edit the same gig again and without changing anything, I clicked on save button and it was denied and removed again.
I contacted them again and they approved the gig again and it is live now. But still they have not mentioned what is the problem.
So, I think its better for me to not edit any gigs now.