Thats the font of minecraft. I dont think you can do anything about it unless you can get Ascii Symbol or something
@Rowinvd you can copy paste these squares into minecraft and see the vertical lines. ⏐ (0x23D0) or ⼁ (0x2F01) or, if you want a squiggly vertical line ⦚ (0x299A) This is your favorite site