Sign text going outside the sign when turning off unicode font after typing maximum letters

What I expected to happen was...:
I typed a sign with maximum letters using unicode font, then I turned unicode font off and expected the sign to be normal

What actually happened was...:
The text of the sign went outside the sign and it looked really wierd

Steps to Reproduce:
1. Turn on unicode font
2. Type something on a sign that reaches the maximum limit for how much you can type
3. Turn off unicode font and look at the sign