[Solved] List contents changing with each iteration

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I think your problem is in the last few lines:

for i in range(len(tuples)):
    for x in range(len(tuples[i][1])):
        [...]
        for neighbor in neighbors:
            for i in range(len(neighbor)-1): #<- HERE
            [...]

Your outer loop is iterating over the index of tuples and stores this index in the variable i. The nested loop at the end overwrites this variable with another value, which is certainly not what you want.

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solved List contents changing with each iteration