Looking at the recent patch notes there's been a glitch with rocket ammo. The fix has made any existing ammo unusable and requiring deletion/dumping.
v244.4
* Fixed an issue with Rockets. Required deleting all existing Rocket Ammo Items once. We are sorry, but it was necessary! Special thanks to Survivor "Rocketreporter" for the extremely helpful bounty report! Requires Server Update, we recommend upgrading as soon as possible!
The latest patch, v244.5 hasn't changed anything that will affect gameplay for us.