Macro identifying tomorrow column as "today", then filling Thursday's column

Attached Code should find the column on the MASTER sheet dated today (Col T) and fill each cell where the file number in Col D matches a file in Col D of the TODAY sheet.

It's picking up the correct row, but then identifies "today" as Column U (tomorrow's date), but then "filling" Column X, which is Thursday!

Option Explicit
Dim a As Long, f As Long, x As Long, y As Long
Dim FindString As String
Dim Rng As Range, Rng2 As Range

Sub MATCHUP()

    With Sheet2
    f = .Cells(.Rows.Count, "D").End(xlUp).Row
    
        For a = 2 To f
        FindString = .Range("D" & a)
            If Trim(FindString) <> "" Then
                With Sheets("MASTER").Range("D:D") 'searches all of column D
                Set Rng = .Find(What:=FindString, _
                        After:=.Cells(.Cells.Count), _
                        LookIn:=xlValues, _
                        LookAt:=xlWhole, _
                        SearchOrder:=xlByRows, _
                        SearchDirection:=xlNext, _
                        MatchCase:=False)
                            If Not Rng Is Nothing Then
                            x = Rng.Row                                      
                            y = WorksheetFunction.Match(CLng(CDate(Now)), Range("2:2"), 0)
                            .Cells(x, y).Select
                                With Selection.Interior
                                .Pattern = xlSolid
                                .PatternColorIndex = xlAutomatic
                                .ThemeColor = xlThemeColorAccent4
                                .TintAndShade = 0.599993896298105
                                .PatternTintAndShade = 0
                                End With
                            
                            End If
                End With
                                            
            End If
        
        Next
    
    End With

End Sub

No idea why, so all suggestions, recommendations and alternatives welcome as ever.

Ochimus