rand() always returns same value, after constant calls from srand(), in different thread

PROBLEM:

In my program, rand() is called twice, and on last call, the return value is always same.

The first call with srand(), returns different value, everytime I run the process;

I read several answers here :
rand() returns the same value, even after a srand
rand() returns same values when called within a single function
srand function is returning same values

All of them say that - call srand() only once in a process, that is the solution - , but in my case that is not the solution.

I append my code and debug result.

CODE:

int rand_history[100000], rand_cnt = 0;
int randNum(int max, int min = 0)
{
    static bool s_seedCalled = false;
    
    if (!s_seedCalled) {
        srand(time(0));
        s_seedCalled = true;
    }
    int rnd = rand();
    rand_history[rand_cnt++] = rnd;

    int range = max - min;
    if (range <= 0) return rnd;
    return rnd % range + min;
}


UI thread:
    randNum(10);            // 1st call

thread 1:
    randNum(40 * 60 + 1)    // 2nd call

DEBUG RESULT:

rand_history = { 14279, 41 }   // 1st run
             = { 14589, 41 }   // 2nd run
             = { 14831, 41 }   // 3rd run
             = { 14988, 41 }   // 4th run
              ....

Is there anybody explain this situation and help me to deal with this problem?

Any suggestion or reply would be appreciated. Thansk. :)