Leni Loud Robredo's VS. Chiz Escudero's Votes: Unintended Mistake Or Dagdag Bawas?

I thought about this screenshot of the unofficial results. Was this just an unintended mistake or was this really dagdag bawas? Dagdag bawas means adding and subtracting for non-Tagalog speakers. Try to take a look at the time of the votes of Leni Loud Robredo vs. Chiz Escudero. At 4:59 A.M. the count of Chiz vs. Leni is 13,014,447 for Leni Loud while Chiz has 4,486,335. When the clock hits 5:30 A.M. the votes of Leni Loud hits 13,050,115 while Chiz's votes drop down to from 4,486,335 to 4,449,913. 

Let's do some Math between Leni Loud and Chiz. Let's take time to see by how much Leni Loud's increased and Chiz's decreased:

13,050,115 - 13,014,447 = 34,668 additional votes

4,486,335 - 4,449,913 = 36,422 votes

What do you think of the possibility that electoral fraud really happened based on the screenshots fro CNN Philippines? Do you think that COMELEC has a lot of explaining to do?