Error exporting power BI data

Hello! I'm trying to export the grouped data in a Power BI table, however, when I try to do that, I get the message "Your data is too big. Some data sampling may occur."

I do not understand why this is due, since yesterday I had only 4533 records and with today's update, they would increase to 4577, that is, I do not even reach 5000 records to consider that the data are large

By accepting the box and exporting the data to a csv, it only exports 300 records, which did not happen previously

Do you know that it could be limiting the number of data to be exported? I appreciate it very much