So my grinding sword has too much enchants and it really is annoying because I cant repair it or add mending to it or do anything and i need an admin to remove an enchant from it (i would rather taking off knockback 2)
Admins won't fix this problem. for combining / repairing anything on an anvil, the cost of it goes up depending on how many times you have done so already. You can only do so 5 or 6 times on an item until it becomes 'too expensive'. It's a part of the game and is not a bug, so admin's cannot abuse their powers to help you overcome this. You will have to enchant a new sword, and try to buy /fix from another player instead of repairing on an anvil until you get all the enchantments you want.