Paste value on filtered cells

Hello,

i was trying to "pasted value" on a filtered cell. but it seems to be pasting it to all cells...
im using a "=concatenate" on several cell, and pasting its value on another cell using "paste value". (this is on a filtered cells) But every time i remove or select all filtered cell. the copied cell was pasted on all cells. is there an easy way on pasting only the value on a filtered cells? FYI I'm using only 1 sheet for this