A problem on grid when filtering on integer row.
The problem is that if user adds a >0 or < 0 as filter. the filter is used even when filter is disabled.

You can see here:

1st (id) column.
if you filter on > 0 or <0 , then disabling the filter by clearing the check box doesn't help and 0 row is hidden ( or all rows in case you set >0)

I need this fix in 6.0