Input control for searching data

[dbereza2009]

I try to make several input conrols for searching data from report dashboard. 

First I create single value control, then put DataType in a Name and Resource ID.

After that add those controls in parametrs and code in my dataset, like:

and  (drd.reg_num like '%$P!{regnumber}%' or drd.reg_num is null)

The issue that it's not working correctly for all parameters which I created. Some of them were not working at all and few of them display incorrect data (1st line is correct after null or blank fields in other lines).

How to fix this or maybe there's a better way for developing this kind of controls?