Why does the value of only one link in a Word template change?

Question

C++ / C#

There is a template with calculations. Added bookmarks and links to these bookmarks in the document. In the program I change the value of these links, but only the very first one changes, why? Here is the code

private void SetTemplate(Word._Document oDoc)
        {
            oDoc.Bookmarks["Days"].Range.Text = Days.ToString();
            oDoc.Bookmarks["FOMS"].Range.Text = Math.Round(FOMS,2).ToString();
            oDoc.Bookmarks["FOT"].Range.Text = Math.Round(FOT, 2).ToString();
            oDoc.Bookmarks["FSS"].Range.Text = Math.Round(FSS, 2).ToString();
            oDoc.Bookmarks["KR"].Range.Text = Math.Round(KR, 2).ToString();
            oDoc.Bookmarks["PFR"].Range.Text = Math.Round(PFR, 2).ToString();
            oDoc.Bookmarks["Result"].Range.Text = Math.Round(Result, 2).ToString();
            oDoc.Bookmarks["RP"].Range.Text = Math.Round(RP, 2).ToString();
            oDoc.Bookmarks["Summary"].Range.Text = Math.Round(Summary, 2).ToString();
            oDoc.Bookmarks["Total"].Range.Text = Math.Round(PS, 2).ToString();
            oDoc.Bookmarks["ZP"].Range.Text = Math.Round(Zp, 2).ToString();

            oDoc.Hyperlinks["FOMS"].Range.Text = Math.Round(FOMS, 2).ToString();
            oDoc.Hyperlinks["FOT"].Range.Text = Math.Round(FOT, 2).ToString();
            oDoc.Hyperlinks["FSS"].Range.Text = Math.Round(FSS, 2).ToString();
            oDoc.Hyperlinks["KR"].Range.Text = Math.Round(KR, 2).ToString();
            oDoc.Hyperlinks["PFR"].Range.Text = Math.Round(PFR, 2).ToString();
            oDoc.Hyperlinks["Result"].Range.Text = Math.Round(Result, 2).ToString();
            oDoc.Hyperlinks["RP"].Range.Text = Math.Round(RP, 2).ToString();
            oDoc.Hyperlinks["Summary"].Range.Text = Math.Round(Summary, 2).ToString();
            oDoc.Hyperlinks["Total"].Range.Text = Math.Round(PS, 2).ToString();
        }

UPD: Here is an example template for more clarity