Homing Switch problem

[Nakus]

Hi
I have a 6040 cnc with USB connection. I have installed, wired and setup Homing limit switches in parallel mode. i have set up Mach 3 software and when Homing CNC, all home perfectly.
But what I have noticed - the spindle moves up in Z, operates the switch in rapid movement, moves off the switch, then slowly operates the switch again and moves away. Same for X and Y. i.e operates the switch twice.
Can anyone give me a clue as to why this is happening.
thanks in advance
Nakus

[CitizenOfDreams]

The first homing is done at fast speed to save time. The second homing is done at slow speed to improve accuracy and repeatability.