Dutch National Flag Python Implementation [closed]

To solve the problem, I implemented the following code:

def sortColors(nums):

    low=0
    mid=0
    high=len(nums)-1
    
    while(mid<=high):
        
        if nums[mid]==0:
            nums[low],nums[mid]=nums[mid],nums[low]
            low=low+1
            mid=mid+1
        
        if nums[mid]==1:
            mid=mid+1
          
        if nums[mid]==2:
            nums[mid],nums[high]=nums[high],nums[mid]
            high=high-1
    
    return(nums)
            

However, for l=[2,0,2,1,1,0], my output is [0, 0, 1, 2, 1, 2]. I don't understand the flaw in my logic.

Also if I simply replace my 3 if statements with if, elif and else, the code works perfectly fine. I am sure I am missing a Python technicality, but I am not sure what it it. Can someone please point it out?