There email validation seems to be inconsistent and not accepting actually valid emails

Essentially, I was doing repeated testing of a different part of my bot, using the same email each time. It was definitely a valid email address, and I am confident that I didn't type it in wrong because (1) I was just "up arrowing" to repeat the inputs and (2) I could see in the logs that is was correct. I think I saw that email fail the capture validation three times but it was at least twice. I have posted the log entries here, I will see if I can find them again. Maybe I am not clear about what the email capture is expected to do. My assumption was that it was just validating that the format of the email address provided was a valid email format.