SHARECOL Text Mode question

I've been studying a few text mode code samples that feature the SHARECOL=true command. I'm stymied now.

I can't figure out why sometimes an attribute stays in the same column and sometimes it gets its own column. I haven't misspelled the command. If I move elements of the report around (and renumber the columns), there is no discerable pattern to when WorkFront will keep the attributes in the same column and when it mystifyingly creates a new column.

I've been through the help site and training materials and haven't found an answer.

Please consider the attached sample and screen shot

Thanks!