I am using Anchor 0.30.1 which is the latest version.I used to use Anchor 0.30.0 and anchor deploy has deployed upgradeable programs.But after upgrading to 0.30.1, it deploys immutable program.This is the solscan link.
https://solscan.io/account/2NCDH9yihzmeApVkVy9a89uRptMHCf6jHZS6YfNd9WFC?cluster=devnet
Anyone could help with this problem?