Pasting Data in spreadsheet adds a ' character

I am pasting the following data file in a calc file

What I am doing is copy/paste the data in the spreadsheet using “space” as a column seperator.
Then I am trying to apply a simple SUM() command in a new column but I get zeros. The reason is that the imported data have a ' character at the beggining.

I’ve notice that when I remove the ' character everything is working as expected. I’ve also noticed that the power changes. I’ve tried to replace this character by using Ctrl + H but the character ' is not recognised. So the questions are

  1. How to get rid of these ' characters
  2. Why the are inserted in the first place
  1. Search string .+ (dot-plus) and replace with & (ampersand) with option Regular expressions ON

  2. Just try Edit-Paste
    Special

    (Ctrl+Shift+V) as Unformated
    text
    and set this options