Muhammad, does your board have any copper tracks on it?
Solder pads?
As Nigel points out, the copper tracks on stripboard should be running left to right (or right to left) and your components are placed vertically. Look at the 555 and 4017....you can see that if you do not cut any of the tracks between the pins, you will have both sides of each IC connected together.
To stop both sides from being connected together, you must break (cut) the copper track at point X. The same applies for the potentiometer.
If your board has no copper, or has solder pads around each hole, you must connect each component lead on the same horizontal line, except where there is an X.
If this doesn't help, post a photo of your project.
Have a look at Nigel's website here:
and you will see that tracks have to be cut at the blue dots (same as X=cut track)