fix: Custom pod replicas deployment

Created by: qinyueshang

Signed-off-by: qinyueshang yue_hong_y@163.com

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##1604 (closed)

Does this PR introduced a user-facing change?

Fix Custom pod replicas deployment. (#1604, @qinyueshang)

Special notes for reviewers:

1. Original design

2. Modified design

/assign @harrisonliu5