Hi @kati,
I have made a tet on my side to delete a single line of text column, and don't have the issue that you mentioned.
Could you please share more details about your scenes?
Could you please share a screenshot of the configuration of your flow?
Could you please explain more details about your sharepoint list and which column is deleted?
Please take a try to recreate the flow to see if the issue still exists.
Best regards,
Alice