This is an annoying bug.
For some reason, my characters in SP mode frequently lose all of their weapons except for an empty SNS pistol and the broken bottle.
I'm figuring this is online related, since it tends to happen when changing from Online to Single player mode.
Anyone else still experiencing this? It's not annoying because of money issues; it's annoying because, for example, I launched SP just a little while ago and received the messge from Tequi-la-la that the bar was being attacked by Vagos. It wasn't until I arrived at the bar that I realized my entire weapon wheel was empty with the exception of the aforementioned DLC weapons.
Needless to say, never bring a broken bottle to a gun fight.