Incident Report Continued..

数ヶ月は、覚悟していたのですが、意外に早いかもしれません。

Hi Takayuki,
Greeting from Syncfusion.
The Excel documents you have shared us (correct.xlsx and wrong.xlsx) have same formula =IF(D5<>"",IF($D$5+COLUMN()-COLUMN($D$5)<=$C$2,$D$5+COLUMN()-COLUMN($D$5),""),"") . However we have modified the formula in wrong.xlsx document as =IF(D5<>"",IF(D5+1<=$C$2,D5+1,""),"") and tried to reproduce the issue.
The CalculatedValue is returned improperly from AK5 cell instead of AM5 cell up to BP5 cell. We have forwarded this issue to our development for further validation. We will update further details on 13th November 2019.