What's the reaosn for this behaviour?
Try:
\starttext
\startbuffer
\start
\setupTABLE[frame=on]
\bTABLE\bTR\bTD text \eTD\eTR\eTABLE
\stop
\stopbuffer
\framed[offset=overlay]{\getbuffer}
\startbuffer
\start
\setupTABLE[frame=on]
\setupTABLE[c][1][align=right]
\bTABLE\bTR\bTD text \eTD\eTR\eTABLE
\stop
\stopbuffer
\framed[offset=overlay]{\getbuffer}
\startbuffer
\start
\setupTABLE[frame=on]
\setupTABLE[c][1][align=right]
\setupTABLE[c][1][align=right]
\bTABLE\bTR\bTD text \eTD\eTR\eTABLE
\stop
\stopbuffer
\framed[offset=overlay]{\getbuffer}
\startbuffer
\start
\setupTABLE[frame=on]
\setupTABLE[c][1][align=right]
\setupTABLE[c][1][align=right]
\setupTABLE[c][1][align=right]
\bTABLE\bTR\bTD text \eTD\eTR\eTABLE
\stop
\stopbuffer
\framed[offset=overlay]{\getbuffer}
\stoptext
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