RidzuanAdznan -I had the same issue and figured this out. I would press 9 just before entering the store or storage inside the cache. It seemed to work but I had to play with pressing 9 before entering cache and inside it.

In addition, I increased XP then went out and hunted, this increases your XP then went back into store and most weapons will be opened.

The health option is the one that seems to always have challenges. It has been working for me (fingers crossed), but the game code changes causing difficulty with this health option.

Thanks to CH team for continued work on this challenging title - trainer makes this game great.