Virtual Joystick Viewport Issue on Inner Scale Project Option

Hi I need urgent help

I am trying to use my project as inner scale, but I am having issue with virtual joystick with multitouch option if the screen size changes. Can anybody fix this .. I attached a very simple sample, can anyone fix it plz.. you can try to change screen size and try to use virtual joystick you will understand my issue.

https://1drv.ms/f/s!AkR04zzPmdhxjoxTdUrR9BA-l9s97Q

Fixed:

dropbox.com/s/29vbrq1j2aipofr/Joystick%20fixed.c3p

I added Anchor behavior to the joystick sprite.