fix: Render wrong form item while multiple branch

Created by: EliChen95

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #https://github.com/kubesphere/ks-devops/issues/537

Special notes for reviewers:

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.: