Using vue3 for Multiple slide when on last slide it does not slide if click Prev

[fatcarter]

Using vue3 for Multiple slides when on the last slide it does not slide if click Prev Steps: Scroll to the end and then click on the Prev button you have to click 4 times to move the slide.

https://codesandbox.io/s/trusting-solomon-ozle7e?file=/src/App.vue

Can anyone help me ?