ok to summarize 
you created a domain on Freenom
your browser, (PC, router, all the way to the ISP) when visiting that domain
is retained DNS data which led to Freenom
because you had the default NS of Freenom in the beginning and it was not hosted anywhere
after alternating NS
your browser still had old data and sent you to the Freenom page
after a while, the browser pulled fresh data and directed you to the correct IP
but you deactivated strap.42web.io because it was problematic (it leads to suspended page)
so I was asking you just in case to see if you have any message in the CA in case it is really suspended
after realizing that there is a redirection
due to the old default URL on the old backup
the new website was trying to access an address that was deleted (I suppose)
and then you corrected it
and now you’re on Cloudflare
and you have problems with redirection loop
if it is WP