State_attributes table abnormal dimesion

Good morning

After updating to:
Home Assistant Core 2022.5.3
Home Assistant Supervisor 2022.05.1
Home Assistant OS 7.6

The size of the table in question has reached abnormal dimensions. I thought that in this table were reported the data common to each single sensor in order to reduce the size of the database. In reality, a new record is created for each change in status or value creating millions of records. Is this a normal situation? Did I misinterpret the function of this table? Can you give me explanations on this? I am attaching a sample image for the sensor “(26) Asciugatrice (Watt) (Offset)”.
Thanks and best regards.