[Python3] submission evaluator has a bug - same test case passed in user test case area.

Hi, this is the second problem that I am experiencing Python3 submission failure for a test case that passed just fine if I tested on the user test case.

Referring to this problem:
https://leetcode.com/problems/target-sum/

Submission result:

Input:
[1]
1
Output:
5
Expected:
1

In user mode, this test case passed with Output = 1 so I am baffled. I experienced another problem yesterday too, same issue, user mode passed, but submission failed.

Did I miss anything?

My code:

class Solution:
    memo = [[-99999999] * 2001 for i in range(2001)]
    
    def helper(self, nums: List[int], S: int, curr_total: int, idx: int) -> int:
        if idx == len(nums):
            if curr_total == S:
                return 1
            else:
                return 0
        if self.memo[idx][curr_total] != -99999999:
            return self.memo[idx][curr_total]
        
        temp = curr_total + nums[idx]
        total = self.helper(nums, S, temp, idx+1)
        temp = curr_total - nums[idx]
        total += self.helper(nums, S, temp, idx+1)
        self.memo[idx][curr_total] = total
        return total
    
    def findTargetSumWays(self, nums: List[int], S: int) -> int:
        return self.helper(nums, S, 0, 0)

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