ive encountered this same issue. im running the following mods on my server:

Map: Tunguska

Extinction Core
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=817096835
Builder's Helmet
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=756389708
Uber Crafter
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=752691369
Castles, Keeps, and Forts Architecture
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=764755314
GateMod Remake
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=817961155
Big Walls
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=541612317

Hover Platforms
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=762778283
Aviary Structures
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=802922362
ecoTrees LITE
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=795044845
Upgrade Station
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=821530042
Kibble Table
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=774762563
Weapons+
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=812639416

Armor+
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=764792033
3's Scorched Earth Stacks
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=758535617
Death Recovery Mod
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=751991809
Omnicular
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=538827119
Awesome Teleporters
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=889745138

I had this issue as well and Extinction Core causes the issue. I don't know why, but Extinction Core overrides the vanilla Industrial Forge with its own custom version that does not unlock the UC Industrial Forge.

If you are having that issue then simply make a custom engram override for this forge that removes the pre-requisites, info on how to do this is readily available.