Dictionary is empty after declaring it and populating - vba

Question

I'm not so good with VBA, thus I'm suspecting an issue with declaring and later on using the dictionary.
I've taken a different approach. Created two functions to creat the dicts.
The for loop first is checking if the Control in userform is textbox, than is getting column number (dict_col) and checks if needs to be formatted as date (dict_for).
However each time the second dict seems to be empty... When I check content of each dict separately (before the loop), it shows correct values.
Public Function import_columns(rng As Variant) As Dictionary
Dim dict As New Dictionary
Dim i As Long
Dim count_rows As Long
Dim dict_k As String, dict_i As String
count_rows = rng.Rows.Count
For i = 1 To count_rows
dict_k = rng(i, 2)
dict_i = rng(i, 1)
dict.Add dict_k, dict_i
Next i
Set import_columns = dict
End Function
Public Function import_format(rng As Variant) As Dictionary
Dim dict_f As New Dictionary
Dim i As Long
Dim count_rows As Long
count_rows = rng.Rows.Count
For i = 1 To count_rows
dict_f(rng(i, 1)) = 0
Next i
Set import_format = dict_f
End Function
Private Sub UserForm_Initialize()
'On Error GoTo ErrorHandle
Dim wb As Workbook
Dim rng_col As Range
Dim rng_format As Range
Dim dc_value As Integer
Dim ctrl As Control
Dim ctrlType As String
Dim ctrl_name As String
Dim key As Variant
Dim dict_col As Dictionary
Dim dict_for As Dictionary
Set rng_col = Application.Union(Range("columns_mark").Columns(3), Range("columns_mark").Columns(2))
Set rng_format = Arkusz25.Range("H1").CurrentRegion
Set dict_col = import_columns(rng_col)
Set dict_for = import_format(rng_format)
'Me.Results.Enabled = False
ListBox1.RowSource = "lista"
txt_results = ListBox1.ListCount
For Each key In dict_col.Keys
'If dict_col.Exists(key) Then
Debug.Print key
Debug.Print dict_col(key)
'End If
Next key
ctrlType = "TextBox"
For Each ctrl In Results.Controls
ctrl_name = ctrl.Name
If TypeName(ctrl) = ctrlType Then
dc_value = dict_col(ctrl_name)
If dict_for.Exists(ctrl_name) Then
ctrl = Format(Val(ListBox1.List(0, dc_value - 1)), "dd.mm.yyyy")
Else
ctrl = ListBox1.List(0, dc_value - 1)
End If
ctrl.Enabled = False
End If
Next ctrl