Recursive Power Query - slightly off

Hello JImAyers ,
you can try this approach instead:

let
  Source = Table.FromRows(
    Json.Document(
      Binary.Decompress(
        Binary.FromText(
          "hdNBDoQgDAXQq0xYS2wLBfQqxvtfY4zGMMAfumBh8lIt338cLqQck1tcWHkVEvnQTnQ9P+dcqoid4Pv8CgUzWpHADGlE7oQfX1PMIRsQ4RZSlLWuS+O6r4imUFMkU2RTyCP4vwimiKZQUyRT5E7U5F5RgJBGbEC0yTEBElvCgGhL+msFBPxEiqKZiL5VfvxYVCtF2UxEXysvw7XBXglKZ9Ia1Ktrm/ML", 
          BinaryEncoding.Base64
        ), 
        Compression.Deflate
      )
    ), 
    let
      _t = ((type nullable text) meta [Serialized.Text = true])
    in
      type table [Employee = _t, Date = _t, #"Days Used" = _t, #"Should Be" = _t]
  ), 
  #"Changed Type" = Table.TransformColumnTypes(
    Source, 
    {
      {"Employee", Int64.Type}, 
      {"Date", type datetime}, 
      {"Days Used", Int64.Type}, 
      {"Should Be", Int64.Type}
    }
  ), 
  #"Grouped Rows" = Table.Group(
    #"Changed Type", 
    {"Employee"}, 
    {
      {
        "Count", 
        each _, 
        type table [
          Employee = nullable number, 
          Date = nullable datetime, 
          Days Used = nullable number, 
          #"" = nullable text, 
          Shuld Be = nullable number
        ]
      }
    }
  ), 
  #"Added Custom1" = Table.AddColumn(
    #"Grouped Rows", 
    "Custom", 
    each List.Skip(
      List.Accumulate([Count][Days Used], {0}, (s, c) => s & {List.Min({List.Last(s) + c, 5})})
    )
  ), 
  #"Added Custom2" = Table.AddColumn(
    #"Added Custom1", 
    "Custom.1", 
    each Table.FromColumns(
      Table.ToColumns([Count]) & {[Custom]}, 
      Table.ColumnNames([Count]) & {"RT"}
    )
  ), 
  #"Removed Columns" = Table.RemoveColumns(#"Added Custom2", {"Count", "Custom"}), 
  #"Expanded Custom.1" = Table.ExpandTableColumn(
    #"Removed Columns", 
    "Custom.1", 
    {"Date", "Days Used", "Should Be", "RT"}, 
    {"Date", "Days Used", "Should Be", "RT"}
  ), 
  #"Inserted Subtraction" = Table.AddColumn(
    #"Expanded Custom.1", 
    "Check", 
    each [Should Be] - [RT], 
    type number
  )
in
  #"Inserted Subtraction"