Taken from ark wiki "Sometimes the Manticore doesn't drop Element, so the amount will be less" also is noted as similar bug but NOT related to it "Unfortunately due to a bug, if the player deals the killing blow to the Manticore, no element will be rewarded." So even if you do not deal the final blow to the manticore it is still a possibility of the manticore no droping element. This being a game known issue related to the Ragnarok map.
Obviously, it is the purpose of the staff that is working on this great cluster of servers to try and improve and bring players into the community. There are a number of things currently being discussed to bring players together and encourage others to try and explore harder content as well as content that isn't readily available on this server. I myself have made an effort to assist in such events and like to think that I am very invested in the future of this cluster and its success. For that reason I am motivated to offer my thoughts here, and no one is under any duress to agree with them or even heed them if necessary.
A lot of recent discussions are specific to the quality of life of the existing player base and new players joining our servers for the first time. Things like implementing the S+ Nanny and coming up with fair ways to continuously improve the experiences for those involved. Some times admins are called on to help pull up foundations, or get a player unstuck after falling through the world or something of that nature. These are also bugs that Wild Card has recognized in the game (and is, or is not patching). That being said, our Admins are happy to assist a player so that he or she doesn't lose their equipment or get stuck and be unable to play the game. This bug is similar to that, in fact it can be fixed with about 5 minutes of effort. About the same amount of time it takes to get a player out of the inside of the world, or finding sunk foundations.
Please understand if this was something that didn't take hours of preparation, farming and organizing to accomplish, then it wouldn't be as big of an issue as it is. However working so hard to accomplish the arena battle and continue to build on ones tribe and what they might have is severely hindered if we don't take action to assist in this.
I would ask, humbly, if you would consider changing your stance on this. Just because the game can have a bug that ends up in a less then ideal situation, I would hope as admins of this cluster you would make up for the lapse in stability in the base game as we do with other bugs and game breaking defects that exist in the base level game. If this is something you feel is too taxing on your current staff, I would be happy to offer my assistance to further elevate any issues that are found on the servers if other Admins are not available.
Please let me know your thoughts, and I welcome an open discussion concerning this particular issue.