This glitch only happens through numbers 1-4. I use the method to make words or numbers on prints:
1) hit the brick with the printer
2) type the letter or number to get it on the brick.
This doesn't work for only numbers 1-4, and I KNOW it's a print pack that is interfering, but idk which one.
*I had to manually pick these numbers from the print menu*
After I saved, but before I reloaded:

After I reloaded the save without altering the sign:

Proof I reloaded:

I KNOW this is a print glitch, but I just do not know which print pack it is.