Strange stamp in passport from USA boarder control

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20 Oct 2002
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Redcar
Just got back from my last trip to the USA, thats 4 inside the last 18 months, all work related.

Every time I've entered the country I get the stamp and the officer has written "WB" inside it to signify waiver business as I only have a ESTA.

This time the guy actually stamped separately "WBWTB1"

I know that if I wanted to stay longer than 90 days I would need a B1 visa but have never applied for one.

Am I going to get pulled up next time about my frequent visits for work just using an ESTA?
 
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