Hi. I think some cats are just more easily distracted than others. I also think that sometimes a cat might take a tiny 'break' while eating, just to look around, and then go back to eating. Feeby is distracted like this, sometimes more so than other times. She also does the little 'break' thing as well, even if she is - like your cat - an all-day grazer and only eats a small amount at one time, she still manages to want to stop for a second or two and then resume eating before she leaves the dish for that 'round'. She does this when I am near her, but she also does this when I take sneak peeks at her where she can't see me while she is eating.
If your cat is doing well otherwise, I don't think it is anything to be concerned about.
If your cat is doing well otherwise, I don't think it is anything to be concerned about.