Params changing when calling a method

Question

I have params with "start_date", "end_date" and "filter"

Before calling this line, params[:start_date] is, for example, "2022-02-07" and end_date is "2022-02-09". So far so good.

format.csv{send_data @records.to_csv(params[:start_date], params[:end_date], params[:filter]), filename: "fileName.csv"}

After calling that line, inside the method 'self.to_csv(...)', if I print the values of start_date now it is the same as end_date.

def self.to_csv(start_date, end_date, filter)
binding.pry # Here, I print the values of the params and they changed for some reason.
...
end

I tried to pass @ records, convert @ records to an array and use that, and even tried to pass params. Every single time, the argument :start_date changes.

Complete (and relevant) model and controller code: record.rb

  def self.to_csv(start_date, end_date, filter)
    titles = %w(title1 title2 title3)
    attributes = %w(attr1 attr2 attr3)
    CSV.generate("\uFEFF", headers: true) do |csv|
      csv << titles
      all.each do |record|
        csv << attributes.map{ |attr| record.send(attr) }
      end
    end
  end

records_controller.rb

def index
    if params[:year].present?
      @delayed_records = Record.unscoped.delayed.not_current_year(params[:year])
      @records = Record.unscoped.getFilters(params[:start_date], params[:end_date], params[:filter]).not_current_year(params[:year])
    else
      @delayed_records = Record.delayed
      @records = Record.getFilters(params[:start_date], params[:end_date], params[:filter])
    end

    start_date = params[:start_date]
    end_date = params[:end_date]
    filter = params[:filter]

    # Everything works up until this point. Params are OK
 
    respond_to do |format|
      format.html
      format.csv { send_data @records.to_csv(start_date, end_date, filter), filename: "fileName.csv" }
    end
  end

To simplify this concept, imagine this situation:

methodA(num){
   print(num)
}
methodA(5)

// Output -> Prints 1