I really like this mod, i have been looking for a torch exactly like this, however i seem to have a problem, the torches vanish from my hotbar and inventory afte a while, i have tried several times with multiple torches in my inventory, and they all vanish after about 15 to 20 minutes.

This is the first I have heard of that issue; that could be a result from one of the recent updates. Then again could be just a bug in the blueprint in the old version(This one) of the mod. I have created a new project a while back to help work on any changes used to incorporate bug fixes for Infinity Torch this mod and smoother mod updates. See thread
That Torch

Yes, sadly the torch disappears. I'm not sure about randomly, but every time I log in it's gone and must use the CC to summon it since I can't find it anywhere to craft.

See the thread that has the test project that addresses these issues.

Bug fixes That Torch

This doesn't appear as buildable anywhere in the current game (January 2021). There's no engram to be learned.

Also, why is there a literal duplicate of this mod in the Workshop with nothing but a different mod name and everything else the same, including author?