Some ZX software(games/utilities) contain bugs in Kempston joystick controll and joystick work incorrect or not work or work only original kempston interface. Big part of this software is fixed for correct joystick controll and compatibility with all existing kempston joystick interfaces/emulators/zx clones.
Here is thread on WOS:
But all this fixed software is in TAP format. Same software exist often also in TRD/SCL and may be also fixed...
As first I fix Artist 1 by Xcellent Software'85 ( downloaded from http://vtrdos.ru/system/ARTIST1.ZIP ). Here is fixed version in TAP and TRD format: