Controller buttons not functioning correctly when two accounts are active on one system

You will need to contact the online support to check if it would be possible to replace the controller. Access Contact us | Xbox Support. Follow the instructions after clicking on the green button "Contact us" and choose to get help either from an online chat agent or request a callback. Make sure the region on the support website is set to your correct region in order not to find issues with the steps.

Hello BlackSamurai24,

Thank you for posting on the Xbox forums. We understand that your Xbox 360 controller's R3 button is not functioning correctly. Does this issue occur when you use a different controller? We suggest attempting to use that controller on a different device.
If the R3 button is not responding, the controller may need to be replaced. Be sure to let us know the results!

There could be any number of reasons for controllers getting stick drift and the buttons stopping functioning correctly.

It could be how the controllers are being used, if they have been dropped, or if the buttons have been pressed really hard quite frequently. It could just be a faulty/dodgy controller.

The controller did this the other day and we called support. Support told me to bind the system and controller with the two buttons like on the 360 (did not know there was this button on the one) so after resetting system and binding the controller and system
all was fine until today when it did it again but did not work binding the two but did not reset the system. So my question is why does it keep doing this. I actually getting fed up with this Xbox one we never had these problems with the 360.

SgtBuck1 - I'm sorry about your experience so far. Unfortunately we're not able to provide any further help on the forums. Have you tried contacting our Phone Support team about this issue recently, after purchasing the new Xbox? They may be able to help.
support.xbox.com/contact-us