Ah, which the OP’s doesn’t.
My very first question to the OP was “did you make any changes to the bootstrap file?” There was no response. I thought about downloading a fresh copy of bootstrap and comparing the two versions, but didn’t follow through. (For that, I wear the dunce cap for the day.) That would have cleared up the 3px difference in the horizontal padding in the .container class div… the OP’s has 12px, the original bootstrap applies 15px. Would have also provided a clue into the OP’s skill level.
The problem with using a .row as a child of a .row was OP ignorance and should have been straightforward to address. Hopefully, the OP read your post.
Too bad the OP has been a non-participant in the attempted conversations.
Thank you very much for pitching in and for adding the working example. I’ll spend some time with it.