I really dont think you understand what I am saying.
However you have modified your code so until you replace it with the current unmodified code we can not provide support.
Look at your search page it is not right.
Keresés - Bikemag Piactér - a kerékpár apróhirdető
I dont see the normal looking classifieds search page there and if you alter things any unexpected behavior can be caused by your changes.
Now if say I mimic a search on your site like so it finds ads based on a high and low price range. As I stated no matter how things are formatted for display which happens after the info is grabbed the price is always stored in a mysql database in number format which is 0.00
All Ads - Bikemag Piactér - a kerékpár apróhirdető eladó dc és element sapi akció - Bikemag Piactér - a kerékpár apróhirdető
If your adding another type of currency make sure to add the correct info so its formatted correctly. All currencies for display that I know of use a . or , for display purposes.