thank you so much

Even it looks like it on this screenshot, there is not really a fix for it.
The character shoots a little to the right und can only set the crosshair to certain distance.
So, the shots will hit on the left side of the crosshair if you are too close.
On a greater distance the shots will move to the right.
Unless c_thirdpersonshoulderaimdist = 0 this will always happen.

Currently I use this "fix":
I have set c_thirdpersonshoulderaimdist = 500 and disable the crosshair every time when I enter thirdperson, because I think irritate more than it helps. But you need still get used to the bullet direction.
I also bind on "mouse4" to switch between the sholders.

bind "shift" "walk"
alias walk "+speed; bind shift run"
alias run "-speed; bind shift walk"
bind "v" "zoomin; r_flashlightfar 9999; r_flashlightbrightness 1.5; crosshair 0"
alias zoomin "firstperson; bind v zoomout; cam_idealdist 20; r_flashlightfar 9999; r_flashlightbrightness 1.5; crosshair 1"
alias zoomout "thirdpersonshoulder; bind v zoomin; cam_idealdist 20; r_flashlightfar 9999; r_flashlightbrightness 1.5; crosshair 0"
bind "mouse4" "leftP"
alias leftP "bind mouse4 rightP; c_thirdpersonshoulderaimdist -1000; c_thirdpersonshoulderoffset -18"
alias rightP "bind mouse4 leftP; c_thirdpersonshoulderaimdist 500; c_thirdpersonshoulderoffset 18"
c_thirdpersonshoulderdist 1
c_thirdpersonshoulderaimdist 500
c_thirdpersonshoulderoffset 18
c_thirdpersonshoulderheight -3.5
cam_idealpitch 0
cam_idealyaw 1
cam_collision 1
cam_ideallag -100
cam_idealdelta 1
cam_idealdist 20-10

Please tell me how you fixed that bug and made it useful