please help i own a 5x modded server and when players loot a crate and get a rocket c4 supply signal then go to the next creat and find another rocket and add it to there invatory the one just picked up does not show up still says 1 rocket.i have tested as well and its like it disapears, 

Your main inventory does not show the amount of each item you pick up, it will only show more than 1 item when you click on it and it will show the "division" amount (generally 50%) If your players have backpacks it will show the stack amount when you put items in the backpack. As you have not listed your plugins it might make it harder to discern whether there is a conflict between "like" plugins