             # because each PR is merged on top of each other in stmp, we can verify against any merge conflicts
             merge_commit = GitHub.merge_branch!(repo_conn,
                %{
-               from: Enum.at(commits, length(commits)-1).sha,
+               from: source_sha,
                to: stmp,
                  commit_message: "[ci skip][skip ci][skip netlify] -bors-staging-tmp-#{source_sha}"}
             )

              Enum.at(commits, 0).author_email
            end

            source_sha = Enum.at(commits, length(commits)-1).sha
            Logger.info("Staging branch #{stmp}")
            Logger.info("Commit sha #{source_sha}")


          gather_co_authors(batch, patch_links))

        head = if toml.use_squash_merge do
            head = Enum.at(parents, 0)
            GitHub.force_push!(repo_conn, head, batch.project.staging_branch)
            head
        else
