The NULL problem in columns

[CATSDANC]

Hi, I ran into such a problem, the data from the table is being unloaded incorrectly, some columns have NULL when dumped.

`+-----+---------+---------------+---------+------------+---------------------+-------------+
| id | columns 1 | columns 2 | columns 3| columns 4 | columns 5 | columns 6 |
+-----+---------+---------------+---------+------------+---------------------+-------------+
| 1 | 103 | 25 | NULL | NULL | 2020-03-11 21:11:18 | NULL |
| 5 | 103 | 26 | NULL | NULL | 2020-03-11 21:11:41 | NULL |
| 19 | 4 | 133 | NULL | NULL | 2021-02-18 17:07:07 | |
| 23 | 3 | 12 | NULL | NULL | 2021-03-30 18:00:03 | |
| 43 | 99 | 33 | NULL | NULL | 2020-08-01 00:53:38 | g4rvhaxnusq

I have used a lot of Tamper, but nothing helps, in some cases columns 3 gives the result -
\x1a÷\x8d\x85\x11e\x91ÁÕ\x14\x89D\x94bEBB®°NÙ\x16kj°çQQ\x13µ´y`

I'm using -v 3, but there are no error messages, what could be wrong? The columns are definitely not empty.

[stamparm]

1. if you have WAF, i can't help
2. if you get junk everywhere, you could have false-positive
3. if you are having binary columns, you should use https://github.com/sqlmapproject/sqlmap/wiki/Usage#binary-content-retrieval