Picking up stacked items glitch

flapsnap96Hello! My server is very OP and when people try and pick up something stacked they get it not stacked. Please tell me how they can pick it up stacked. (URGENT)

Hello,

So basically player are picking up items that are meant to be stacked but they are picking up as it is a single item

Before anything try adding this permission if you have nt yet added it
essentials.oversizedstacks

If this did not work Listing your plugins would help as you are not giving us too much to go on it could be a plugin that could be doing this but we wont know till you list a full list of the plugins you run on your server

I have no idea, must be some plugin setting.