why it doesn`t stop at first double numbers

[j.crater]

I think I understand what you want your program to do. But I am not 100% sure.
Actually, I think your program may be working fine. What is confusing could be a lot of prints.
In each loop, there is:

    print(copy) #  previous number
    number = random.randint(1, mnum)
    print(number)  # current number

So you need to check result in pairs, example:

Output:
(first iteration)
2
1
(second iteration)
1
2
(third iteration)
2
2
(two in a row).

Maybe try printing like this:

# ... code before

while tryes < repeats :
    copy = number
    print("previous number: ", copy)
    number = random.randint(1, mnum)
    print("current number: ", number)
    print("-------")

# code after ...

Did this help? Please clarify more if I didn't answer your question.