tekxit 3 mods dont work in server

i started a server on aternos with the tekxit 3 modpack. i tested the game in single player to see what mods the modpack had and all was well, so i created a server to play with some friends but when we started playing we realised that some or alot of the mods were not working and they worked in single player. is there anything i can do to get them working or is it a lost cause?

Edit: so i just realised none of the mods work except the mini map and too many items

Edit2: i did some more testing and the modded items are there but if i go into creative and try place down a modded block it disappears instantly, also crafting the items doesn't work eather. (no crafting recipes)

i did, at least i think i did. i clicked on software, modpacks, technic and tekxit 3. it should install automatically right? i did click on the reinstall button btw. surely if all the items show up in too many items the modpack is installed allready.

ok it looks like that fixed it. im not sure why it didnt work the first time as i did exactly as you said to do the first time, anyway... i wont add to this thread unless there is anything else, which i doubt. thank you