Why the layer number does not increase monotonically during print?

Basic Information:

Printer Model: Prusa i3MK3S+
MCU / Printerboard: Einsy
Host / SBC: RPi5

Describe your issue:

While the printer was printing, I tried to measure the time it took to complete that particular layer. However, on the right of the mainsail GUI, the layer number does not increase monotonically. For example: 390, 393, 391, etc. How come? Is there a better way to measure the actual time it takes for the printer to print in any particular layer?

Have you checked the gcode file?
Are the layer numbers in sequence there?

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