I think this happened after installing the 2.0 update.

 

My Cladhaliath had the draining and reliable enchantments pre-2.0 patch - now it only has the reliable enchantment according to the item description. I loaded my old saves and my Cladhaliath all had only the reliable enchantment.

 

Tried to test it in battle as well - didn't notice any endurance increase when my weapon struck.

 

Save game link is below:

https://www.dropbox.com/s/rj1pcdu02nsynvc/Quicksave%20Saved%20Game%20%28greckoboy%29.zip?dl=0

 

Previous save game link (made pre-2.0 but still affected) is below:

https://www.dropbox.com/s/1l20z9j9adndhkw/03805443f42c4366987efa58af2a6c33%2012797207%20Elmshore.zip?dl=0

Hello greckoboy,

We are aware of the issue as it has been already reported on the forums. Please use the search function before posting bugs to make sure they haven't already been posted.

 

http://forums.obsidian.net/topic/81573-draining-enchantments-disappear-upon-saving-bug/?hl=draining

http://forums.obsidian.net/topic/81335-draining-weapon-mod-removed-from-game/?hl=draining

 

Thank you for your support. 

Sorry, I searched the forums for Cladhaliath, didn't realize it was affecting all draining weapons!