I tune to local FM station for example 98.5 MHz, press 1GHz button
which should turn that into 1098.5 MHz, but i still hear local FM
station, just a little bit weaker (for 20 or more units). It appears
lot of users have this problem. Did anyone found solution to this
problem ?

It must be something with the filter, like it is not fully applied, or
maybe not applied. Did anyone managed to fix it?

thanks