There’s a range of methods you could use to get the same effect. You could have a checkbox to say “yes I want to use two columns” and then check / uncheck as necessary, a select box as you do, or even just filling out two textareas and checking if the second one has anything in it and if a second column is necessary.
However you decide to do it, and however works best for you, it’s just important to keep in mind whether you’re looking at fields or sub_fields and using the correct function accordingly, otherwise it’ll stop working for no reason in particular.
If any fields you reference are INSIDE the flexibile content, you need to use the_sub_field() or get_sub_field() to see any content.
Hopefully that should resolve your problem and you’ll start to see some content come through
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