Thank you so much for fixing the problem, I really appreciate it.
Now I really should tell you that I didn't ignore your advice at all, I read the instructions and spent quite a bit of time with the column options. The instructions say nothing about the "width" of the columns, only the "position", so I kept making changes to column 2, which did nothing.
Now that I see the changes that you made, I can understand what is going on and won't have this problem again, but I think the instructions could be more clear about what "col-md-4" does, for example.
Again, thank you so much!