ARM A9 bare matal IRQ priority can't work

I use cyclone V HPS, and there is a problem in configuring interrupt priority. I gave OSC1 TIMER a higher priority, and after the program was executed, I found that it could not preempt the low priority external interrupt from FPGA. Look at the priority configuration MASK and binary point are lower 3 bits. Excuse me, where is my configuration wrong.

The OSC1 timer runs normally as shown in figure 2. after the interrupt from FPGA is enabled, the timer interrupt cannot run normally, as shown in figure 1