1
If you are using a touchpad on a laptop, that is the usual cause of the problem.
Open the Settings app, go to Bluetooth and Devices - Touchpad.
In there, you should find the sensitivity settings, try to decrease that setting or if there is a setting like Palm-Check, enable that setting, then test if that resolves the problems.
2
If you are using an external mouse on a PC, if there is specific software provided for your mouse, check in there for similar settings to change the sensitivity on your mouse.