In commit c39338398e2629effeabdcc05c91e244836ae7ea, Recipes makes use of two CJK-compatibility characters to represent the symbols for Celsius and Fahrenheit degrees. Those characters, U+2103 and U+2109, are not the preferred encoding to represent the symbols in Unicode text; the preferred way is by using U+00B0 DEGREE SIGN and the ASCII letters C and F. By using the compatibility characters, the application doesn’t look right as Cantarell (as well as most fonts) don’t include glyphs for those code points, so the system has to fall back on DejaVu or another font including them, which looks sloppy due to different font metrics.