[Problem] Reinforced Door untextured?

  • Hiya. Recently, me and my friends set up yet another server using IC^2 alongside other mods, this time updating to v1.81.
    However, when preparing my nuclear reactor site, I noticed that when placing the reinforced door, this occurs:

    The pink and green squares are actually reinforced doors, so the texture seems to be glitched. Same occurs for my friend. Does anyone know why they show like this and if so, how to fix it?
    I run a long list of mods, if needed I can provide it.