Domain registration fees come in three variants. New domains will require a registration fee. Every subsequent year requires a renewal fee to maintain the existing registration. Moving an existing registration to another registrar requires a transfer fee.
All of those fees are typically associated with a one year period being added to the term, although some top level domains behave differently. I think uk is one that uses different transfer rules. I don’t use any such TLDs, so I can’t offer a definitive list without taking time to search for it.
If you aren’t seeing the transfer date extended after your transfer competes, which is usually a five day period, you can open a registrar support request from your Cloudflare dashboard.