The font weight of the editor is always bold. If I go to Edit > Preferences > Interface > Fonts > Editor any font I choose will use the bold weight. Only the editor font does this, the symbols list and message window font both use the font weight selected.
I'm not using any color schemes, and file type is none (which I assume turns off syntax highlighting). I was using Geany 1.35 from the Ubuntu eoan repository. I uninstalled that, deleting all the configs, and just built the latest git version (1.37 Using GTK+ v3.24.12 and GLib v2.62.1 runtime libraries) and the result is the same. Choosing a font and switching between the normal and bold weight will result in no change, it will only use the bold weight.
If it's some obvious setting I missed I apologize. If there's anything more I can add please let me know. Thanks!