Tranform base64 to xls (it is removing decimal values)

I am working with an API that returns me an XLS in base64,

    Source= Web.Contents("https://domain/api/xls ",

    [

       Headers=[

          Accept="*/*",

          #"content-type"="text/plain; charset=UTF-8",

                ],

         Content=Text.ToBinary(request)     

    ] ),

   #"textBase64"=Text.FromBinary(Source),

   #"BinaryFromTextBase64"=Binary.FromText(#"textBase64”, BinaryEncoding.Base64),

   #"Document" = Excel.Workbook(#"BinaryFromTextBase64")

I am having an issue, when I do that all columns are correcting returned, but two columns with decimal values are returning blank. (If I do this process manually it works well) -> (base64 to file .xls)

To contextualize, I have two ideas about the possible reasons:

First: I am working with Brazilian documents, I am thinking that have a relation with the decimal format

Second: XLS is from  97-2003, when I open it manually it is in compatibility mode.

I tried many things and I am stuck ☹️😖