Gemini man's chart shows Taurus? What is right?!

So this Gemini I'm getting to know is born on 21 May, he's supposed to be Gemini, but his chart shows Taurus sun?!

Is he more Taurus than Gemini? I don't get it.. can someone help with this?

This is his chart

https://alabe.com/cgi-bin/chart/astrobot.cgi?INPUT1=J&INPUT2=&GENDER=Male&MONTH=05&DAY=21&YEAR=1987&HOUR=12&MINUTE=00&AMPM=PM&TOWN=alexandria&COUNTRY=EGYPT&STATE=&INPUT9=&Submit=Submit

Its on the cusp between Taurus and Gemini. So unless you have exact tob and location it could be either or.

So I found out he's born around 1-2 pm ... it still shows hes got Taurus sun.. but he acts so like Gemini

uh so confusing

Update:

Getting to know more about him, he's a true Taurus Gemini Cusp. It really fits him reading about it and it's so strange but interesting really when someone is born on the cusp.

My dude is on the gemini cancer cusp. A few hours later and he would've been a cancer. And yeah, he's very crab like... but also cancer mercury so who knows.