Do you have your drivers defined correctly? I use TMC2209’s. Everywhere I have one defined below, you should have uncommented and replaced with DRV8825. I also have a previous firmware posted here ( Lowrider - SKR 1.3, Dual Y and Z, TMC2209 UART, Sensorless Homing ). You would have to change driver types, homing direction, and sensorless homing. You should be able to compare it with what you have using a tool like WinMerge.
#define X_DRIVER_TYPE TMC2209
#define Y_DRIVER_TYPE TMC2209
#define Z_DRIVER_TYPE TMC2209
//#define X2_DRIVER_TYPE A4988
#define Y2_DRIVER_TYPE TMC2209
#define Z2_DRIVER_TYPE TMC2209
//#define Z3_DRIVER_TYPE A4988
//#define Z4_DRIVER_TYPE A4988
//#define E0_DRIVER_TYPE A4988
//#define E1_DRIVER_TYPE A4988
//#define E2_DRIVER_TYPE A4988
//#define E3_DRIVER_TYPE A4988
//#define E4_DRIVER_TYPE A4988
//#define E5_DRIVER_TYPE A4988
//#define E6_DRIVER_TYPE A4988
//#define E7_DRIVER_TYPE A4988