i am having the same problems.
Layout Version 1.8.8.
I am using two tag classes ".col-left" and "col-right" in multiple rows.
When viewing the source-code of the website the tag classes are there.
When i am in a new session and open one row/col in layouts the tag class field ist empty.
But when i add the tag class in one single row again and save, then the classes reappear in most of the other rows again. When i delete the class in one row, same happens to the other rows.