Problem with my modded forge server

Okay so here is the thing, I need help with my forge server. I installed the 1.16.5 forge version to make a private modded minecraft server with me and my friends. I installed a few mods that work perfectly fine but they don't make any big changements (itemphysics, bettersound...). I also have 3/4 others bigs mods that add a lot like (oh the biome you'll go, I like wood, spartan weaponry...) , they work great on my solo games but not on my server. When I put my self in creative I see the items, I can pick them, but not crafting them. Why ? I don't understand. I placed them in the mods folder and all but it simply don't work. I really need help.