That happened because you don't have all the tags in your fork that upstream has. The last tag for copr-frontend in your repo (https://pagure.io/fork/praiskup/copr/copr/) is copr-frontend-1.149-1 so the version is being derived from that last tag.

Do you have a remote for the copr upstream repo defined? If yes, then run:

 git fetch --tags upstream

If no, you first need to define it and then when you next run git pull --rebase <upstream> it should automatically fetch the tags as well. If you did e.g.

git pull --rebase https://pagure.io/copr/copr.git to rebase the branch, that doesn't fetch the tags in the current version of git.

ok, it isn't convenient to sync the tags at all, but makes sense