(initially tabs and data were more, I left only those that demonstrate the problem)
1) there are two tabs: "4" and "5"
2) on the tab "4" a lot of data (more than 3600 rows), in cell O3628 there is text and hyperlink
3) on the tab "5", the last data cells (press Ctrl End in MS Excel to go to the last) is S278
but when we open this file in the FPSpreadsheet component, the tab "4" is displayed normally, and on the tab "5" the last cell is not S278, but O3628 and it incorrectly displays the URL of cell O3628 from the tab "4".