If you mean where is http: CL is constantly trying out and applying different filters and probably one of then had a glitch and made these modifications. I have a waaaaay old, like 4, 5 or 6 years old craigslist account. So how do I post in my home city when I am on vacation many miles away.
Your email address will not be published. If you are creating new posts with the same email, it will not work once you have been put on the shit list.
Posting the same ads everyday will make you more likely to get ghosted. Your post becomes like a ghost wandering the back halls of Craigslist aimlessly looking for someone to see it, but no one can find it. Only sellers generally get blocked so it would have to be a very severe case for CL to block an IP completely.
Every time one thing fails, move on to another. This is old fashioned Ghosting of your post.