1. Go to console and write "+duck".
2. Stay in console and write "cl_lw 1"
3. Then write "cl_lw 0"
4. Write to console "-duck".
And this is all, have fun with new crosshair! <3
(cl_dynamiccrosshair 0 might be the problem, so turn it to 1 before applying this.)

I hope I helped ;)
If you like it you can give me so steam points and share it to friends :)