Arduino Counter outputs only 1 and 3

[dann11]

Hi! I am writing a program code in arduino, it will function as a counter. As I do Serial.println with the counter it only outputs 1 and 3.

I am simply using codes as:

count = count + 1;

I am using the same formula with some of the other counter but the rest are working perfectly well except for this counter, which only outputs 1 and 3.

What might be wrong?

 

[Altaero]

And what is the rest part of the code? Show all code.
The first thought is you modify count somewhere else.