SBI Shoken 入出金 date mismatch?

[CluelessToshika]

Something I've been wondering about - some of the dates reported in the "入出金明細" don't seem to match with the timeline the rest of the universe is in.

For example, I received a small payment in my Shinsei account from SBI on September 13th, the origin of which wasn't clear.

Checking the "入出金明細", it appears to consist of a dividend and some points, however in "入出金明細", the dividend receipt is dated September 17th, the point payment on September 18th (even before this timeline advanced to September 18th) and the transfer to my bank account as September 17th.

It's not a problem per-se, but does anyone know why this happens?