Multiple readings return double, triple... of the original frequency

[badomenspeaking]

Description

Steps To Reproduce Problem

Compiled and running. Read pulses from frequency generated from another Arduino UNO with the FastPwmPin library.

First reading is always OK. next readings return 2, 3, 4,... times the original reading...

Hardware & Software

Board: Arduino NANO with ATMega328P + IC: ICM7217 4-digit 7-segment driver
Arduino IDE version: 1.8.19
Version info & package name (from Tools > Boards > Board Manager): Arduino Nano
Operating system & version: Windows 10

Arduino Sketch

#include <FreqCount.h>
#include "ICM7217.h"

void setup() {
ICM7217_init();
FreqCount.begin(1000);
}

void loop() {

if (FreqCount.available()) {
unsigned long count = FreqCount.read();
uint16_t f = count;
ICM7217_pulses(f);
}
}