This caracter "⌂" is located on the font folder that contains "default8.png".
The caracter is located in the row 8 at the column 16.

This bugs doesn't affect the version what device am I playing on, it's was tested on a Android Device and on a Windows 10 Desktop Device. This bug is on the game and not by the device itself.

Except display "default8.png" font texture, it's display on the "glyph_??.png" font texture. It's was tested by 2 different texture font. And no mater how different the texture is, it's can't be fixed.