Two issues with ^BVSP on 1.12.18 !!!
First problem. Summary page offers the Wednesday close for the index. The Thursday close per your site is 79365.
Second problem is that the change is incorrectly calculated. Assuming ^BVSP's 1/12/18 close is accurate at 79,349.12, the change should be 15.88. Your problem may be that the Thursday close is correct. the WSJ says the Thursday close was 79365.44. If that is the case, the 16.32 change is correct. In other words, your data is a bit of a mess. PLEASE CHECK AND REFRESH.
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Charles Blaine
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