I am having this exact same problem … content is being displayed without any bootstrap css. No ideas.
I moved your issue to a different topic, because it did not answer the other thread’s OP and you will need to share your code for us to help you anyway. A separate topic does not disrupted the other thread.
If you have a codepen you would like to share, that would be very helpful. Also, you should describe to us exactly what content is being displayed and what you were expecting it to look like.
Also, confirm that you have linked the applicable Bootstrap library (version 3 or 4) to your codepen.