Wyze Plug Outdoor Timer Issues

Whenever I use my Wyze Plug Outdoor my timer resolutions aren’t accurate. They are all over the place. I have tested this by using a peristaltic pump to send water to a graduated cylinder. If I use a trigger to turn off the outlet after a certain amount of time the outlet will shut off before that time, at the set time, or will overshoot altogether. This is the only real issue that I am having. Is anyone else experiencing these types of issues?