QPS/Sum values don't match with QPS/Sum on Query details

STR:

1. Install PMM 2.28.0
2. Add PDPGSQL to monitoring
3. Run sysbench read-only script, for example:

    /usr/share/sysbench/oltp_point_select.lua  --rate=0 --db-driver=pgsql --pgsql-user=postgres
   --pgsql-db=sbtest  --percentile=99 --time=1000 --threads=1 --report-interval=10 --tables=1
   --table_size=1000000 --rand-type=uniform run

4. Open QAN page in a few minutes and select last 30 min period
5. Click on Total
6. Compare QPS values

Actual result:
See QPS, Sum and and Query time:

Expected result: Values should match.

I checked the same for not so intensive load and in this case the values were the same.
See:

Additional information: With pg_statements everything looks ok

I checked the same scenario for MySQL and found that we have the same problem

And the same problem exists for Mongo. I think all DB are affected in case of time range like from 2022-06-10 06:20:00 to 2022-06-10 06:20:00