Sandy pretends to understand "every", but doesn't

I told Sandy, "Remind me to do something every Tuesday evening".

She responded with an email "Do something" on Tuesday evening, but she did not store this as a recurring thing every week. I know that I can do this with "Tuesday @weekly", but "every Tuesday" sounds more natural. Sandy even parsed the "every" and stripped it from the reminder, so it looked like she understood. Why not make this just work?
 
sad I’m confused
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