Sensonoasase

I noticed one more discrepancy in the early kabu/heya information between Dekiyama and Onomatsu: Dekiyama's first entry shows it as belonging to Onomatsu during ~1917 to ~before 1927. But if we look at Onomatsu: Onomatsu is listed as a part of Takasago during that window. 戦争の浅瀬

Gentlemen, I may have found three possible errors in early Kabu data in SumoDB. I recognize these are all about a century old and hard dates can be hazy, but I'm trying to reconcile heya iterations as far best as I can and ran into these seemingly erroneous dates with invalid month numbers in the MM.YYYY format: The first row for Irumagawa has the end date as '31.1922'. Judging by the start date of the next row, I'm guessing that's supposed to be 01.1923 instead? Similar issue for Tatsunami where the first row has an end date of '13.1915'. I'm guessing that should be '12.1915' based on the start date of the next row? Same thing for Tokiwayama but on the second row this time with and end date of '13.1927'. Should that be '12.1927' based on the start date of the next row? I apologize if this isn't the proper place to post this. I was unable to find any firm sources other than SumoDB for these dates to confirm or reconcile the numbers. 戦争の浅瀬