I found that the printed circles are not perfect circles.

[pxysea]

rinter configuration: Marlin 2.1.x + TMC2209 drivers.
After calibration, I found that the printed circles are not perfect circles. What could be the reason for this? What should I do?
M503 results:

20:48:02.645 : N2064 M503*21
20:48:02.648 : echo:; Linear Units:
20:48:02.649 : echo:  G21 ; (mm)
20:48:02.650 : echo:; Temperature Units:
20:48:02.651 : echo:  M149 C ; Units in Celsius
20:48:02.653 : echo:; Filament settings (Disabled):
20:48:02.653 : echo:  M200 S0 D1.75
20:48:02.654 : echo:; Steps per unit:
20:48:02.656 : echo:  M92 X81.40 Y80.34 Z398.68 E415.40
20:48:02.657 : echo:; Max feedrates (units/s):
20:48:02.660 : echo:  M203 X500.00 Y500.00 Z3.00 E200.00
20:48:02.662 : echo:; Max Acceleration (units/s2):
20:48:02.662 : echo:  M201 X1000.00 Y1000.00 Z100.00 E2000.00
20:48:02.667 : echo:; Acceleration (units/s2) (P<print-accel> R<retract-accel> T<travel-accel>):
20:48:02.668 : echo:  M204 P3000.00 R1000.00 T5000.00
20:48:02.673 : echo:; Advanced (B<min_segment_time_us> S<min_feedrate> T<min_travel_feedrate> J<junc_dev>):
20:48:02.674 : echo:  M205 B20000.00 S0.00 T0.00 J0.05
20:48:02.675 : echo:; Home offset:
20:48:02.676 : echo:  M206 X0.00 Y0.00 Z0.00
20:48:02.677 : echo:; Endstop adjustment:
20:48:02.677 : echo:  M666 Z0.00
20:48:02.678 : echo:; Hotend PID:
20:48:02.680 : echo:  M301 P24.51 I2.60 D57.72
20:48:02.681 : echo:; Bed PID:
20:48:02.682 : echo:  M304 P117.34 I22.04 D416.56
20:48:02.684 : echo:; Retract (S<length> F<feedrate> Z<lift>):
20:48:02.685 : echo:  M207 S3.00 W13.00 F2700.00 Z0.00
20:48:02.686 : echo:; Recover (S<length> F<feedrate>):
20:48:02.688 : echo:  M208 S0.00 W0.00 F480.00
20:48:02.690 : echo:; Auto-Retract (S<enable>):
20:48:02.691 : echo:  M209 S0
20:48:02.692 : echo:; Stepper driver current:
20:48:02.693 : echo:  M906 X680 Y800 Z800
20:48:02.693 : echo:  M906 I1 Z800
20:48:02.695 : echo:  M906 T0 E800
20:48:02.695 : echo:; Driver stepping mode:
20:48:02.695 : echo:  M569 S1 X Y Z
20:48:02.698 : echo:  M569 S1 I1 Z
20:48:02.699 : echo:  M569 S1 T0 E
20:48:02.699 : echo:; Linear Advance:
20:48:02.701 : echo:  M900 K0.86

Thank you.