Gmail spam filtering is broken. 4 emails from gmail a/c to gmail a/c, 1 goes to inbox, 3 to spam!!

I sent 4 emails from my gmail account to the same gmail address. 3 made it to the spam folder, 1 to the inbox. The last of the 4 was in the inbox. The recipient was surprised to find many other relevant and useful mail in the spam folder. Too many false positives!.
 
sad I’m frustrated
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