Why did he ask for a hug?

There is this guy who is an acquaintance I have seen him maybe 8 times since he is the guy who do maintance to the A/C in my house. At the end of one of the visit he asked me to give him a hug.
While I know a hug is innocent and has nothing to it. If is an spontaneous goodbye hug ok but out of the blue to say come over here and give me a hug. I find it very ramdon. Is this normal? We are both married.
Why did he ask for a hug?
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