@pedrodu69 Did you by any chance open a CSV file by directly clicking on it, or opening it in Excel? If so, try to import the file via the Data Ribbon. Get Data, From Text (Legacy) and follow the instructions. In step 3 of 3, make sure to mark all columns creating problems as Text. That will preserve them as texts. Otherwise a "number" like 5.46 may be interpreted as May 1946, just like in your screenshot.