Excel places the artifacts on top of the cell. What is it and how to remove it?

Question

excel

Who faced or knows what it is, please write how to remove it. Artifacts highlighted in red. Tried to change the encoding - did not help.



When entering data into these cells, the artifact remains, the data is not visible, but it is present in the line above.
Link to file: click

Answer 1

Danil O'neil , you have some kind of graphical object between columns M and N. Open with Google Sheets, then you can see and delete.

Screenshots (normal and not so good :-|~ )

Answer 2

Do a hardware upgrade.