On my server we have stacksize of 20 from explosive when u have more mats and want to craft 60 it dont work it dont make automaticly 3x20 stack I can only craft 20 once and then I need to repeat again to get 60 why it dont work when the size is 20 and I want to craft 60 that it splitts 3x20 stacks automaticly?

Rust controls the crafting limit, not this plugin. Assuming your stack sizes are set up properly, the items should stack together each time you hit craft.