@MultiFacedMedia This means that you have in-fact, not set everything properly. It mean that you have items or techs equipped not in the server, which makes you get kicked out. There is also the possibility you have installed a few incompatible client-side mods with the server. In addition, you may possibly have missed out any mods from the modpack, or have mods left over from previous that you weren't aware of.
Check C:\Program Files (x86)\Steam\steamapps\common\Starbound\mods
Check C:\Program Files (x86)\Steam\steamapps\common\Starbound\assets
In assets folder, there should only be "user" folder and "packed.pak" file.
In mods folder, there should only be "mods_go_here" file.
Browse > Subscribed items
Go through this list and find out which mod is broken.
Go to the lounge sections of the forums to join the Discord server if you need more help more reliably. The channel you would be looking for is #technical_support