controller acting like a mouse and only acts up with epic games not steam

this doesn't work for me because it doesn't say alpha it says razer

I'm Roshan V S, Windows expert and a Windows user like you.
I appreciate you for providing details about the issue and we are happy to help you.
I know it is very frustrating when your controller acting like a mouse.
Try these methods to disable mouse functionality on your controller.
Method 1.
1. Go to control panel, then go to devices.
2. Click the mouse tab on the left panel. then click Additional mouse options from the right panel.
2. Click the hardware tab and you should see two of "HID-compliant mouse",
3. Find the one that has it's location set as AlphaMouse, then go to properties and disable the device.
Now your joystick won't move your mouse cursor, but we're not done.
4. Go back to control panel and go to Keyboard.
5. Again find the hardware tab and you will again see 2 drivers,
6. Find the one that is AlphaMouse. I was unable to disable this, but I uninstalled the device and it fixed my controller's D-Pad and face buttons from inputting keyboard functions.

Method 2.
Maybe this problem because of Steam.
1. Open Steam app Menu and select ‘Settings’ option.
2. In the Settings window, locate ‘Controller’ tab and when found, click open the tab
3. Next, hit ‘General Controller Settings’ button and from the general settings screen visible on your computer, uncheck the ‘Xbox configuration support’.
4. Unchecking this option should resolve the problem.

Do get back to us with the result. We will be glad to help if you need further assistance.

:)