Issue description:
The buttons on the screen doesn't show up when using "Elevator Button Screen Module"
With "Button Screen module" doesn't show up too.
Only one button at the top of the screen shows up.

By the way, the elevators work fine when clicking on the text.
It's a little bit annoying to have only one button on the screen :(

Steps to reproduce:
Make elevators and connect them with "Elevator Button Screen Module" or do it with "redstone receiver"
Put the module in the screen and see there is only one button and other only text

Versions:

• Minecraft: 1.12.2
• Forge: 14.23.5.2837
• McJtyLib: 1.12-3.5.4
• RFTools: 1.12-7.73
• Optifine: 1.12.2_HD_U_F4

Possibly incompatible mods and versions: Optifine ?

Screenshots:

With "Elevator Button Screen Module"

With "Button Screen Module"

But if do not write text in label there is also 1 button on the top of the screen

Can you try without optifine?