Data_free value is too big in SHOW TABLE STATUS

Good day.

In some tables Data_free value is a really big 18446744073709150790 or 18446744073697848158, etc.

These tables are very small - less than 1 MB and less than 1000 rows.

Max_data_length is 9223372036854775807.

Rows and Data_length are correct.

Index_length are different in these tables.

Engine = TokuDB

Row_format = tokudb_zlib / tokudb_lzma

Recreating tables and analyze has no effect.

Restarting the database has no effect.

In my.cnf :

innodb stats auto recalc = ON (default)

innodb stats on metadata = ON / OFF (no effect)

innodb stats persistent = ON / OFF (no effect)

innodb stats method = nulls_equal (default)

OS = CentOS 6.9