Oracle didn't write archivelog on Solaris (Release 10.2.0.4.0)

I have a database on production (archivelog mode)

Made a backup on prod and restore to uat.

This database has 4 redolog group. It write to two location ( u04, u05).

Everytime I refresh the uat, it has no issues. But this time, it decided to not write on u04 (hence, no archivelog there) but archivelog does exist in u05 ( archivelog numbered 1,2,3,4).

Typing alter system switch logfile will give no result, it just stop there ( but can be cancelled).

After the uat runs for a few hours, trying to backup will fails with rman trying to look for archivelog numbered 34, even though in u05 there is only archivelog 1-4 and none in u04. It shows that internally the archivelog grows, it just didn't get written to disk.