Difficult to reject incoming calls

[coffent]

When a call comes in, the screen shows a handset in a circle with a message saying swipe up to accept, down to reject. While swiping up works, I must swipe the circle down at least 3 times to get it to reject the call. Why? How can I reject the call in one swipe? Thanks.

 

[tube517]

Which phone do you have?

What android version?

 

[coffent]

Motorola Moto XT1806
Android 8.1.0