Exposed between-filter uses [min] value as [max] value in query

After submitting a an exposed filter form, the url looks like this:

... field_avg_score_value[min]=6&field_avg_score_value[max]=8 ...

But the query looks like this:

...
HAVING (( (AVG(field_data_field_avg_score.field_avg_score_value) >= 6) AND (AVG(field_data_field_avg_score.field_avg_score_value) <= 6) ))
...

Note: I am using aggregation.
Using latest D7, ctools and views dev.