Not a bug, although it may be unexpected. It's a grid snapping thing. Try:
\def\example{%
Lorem ipsum. Lorem ipsum. Lorem ipsum.
Lorem ipsum. Lorem ipsum. Lorem ipsum.
Lorem ipsum. Lorem ipsum. Lorem ipsum.
Lorem ipsum. Lorem ipsum. Lorem ipsum.
Lorem ipsum. Lorem ipsum. Lorem ipsum.
Lorem ipsum. Lorem ipsum. Lorem ipsum.
\startMPcode draw fullcircle scaled 1cm; \stopMPcode\
Lorem ipsum. Lorem ipsum. Lorem ipsum.}
\starttext
\example
\startcolumns[grid=off]
\example
\stopcolumns
\stoptext
-- Max
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