Steps to reproduce

1. Place a sign.
2. Type some text on the sign.
3. Look at the sign from different distances and angles.

Expected result

You see the sign, and the lettering that you put on it, and nothing more.

Actual result

There are extra 1-pixel-wide lines through the sign text. They are the same color as the text. See the attached pictures, which have the glitchy lines circled in red.

Note

I have a GeForce 750 Ti and the glitchy lines show on all but the lowest anti-aliasing setting. At that level the anti-aliasing seems negligible and things are unpleasant to look at.