Text Display is not symmetrical with its sight line in F3+B

Facing north and use the command block with

summon minecraft:text_display ~-0.5 ~0.5 ~-0.4999 {text:'{"text":"|||||||||||||||||||||||||||||||||||||||||||||||||||||||||"}',line_width:81,background:-16711936}

 // "~-0.4999" is to avoid z-fight

As you can see, the blue line is in the right middle of two blocks, but the text is not symmetrical with it. I found that the text always be a little left(0.0125), when you use

summon minecraft:text_display ~-0.5125 ~0.5 ~-0.4999 {text:'{"text":"|||||||||||||||||||||||||||||||||||||||||||||||||||||||||"}',line_width:81,background:-16711936}

 
the text will look like at the center of the two blocks. It seem harmless, but I am curious about the reasons behind it and I'm not sure if this is not my problem.

Thank you and have a nice day!