I guess, you have set the two double arrows at the breakpoint bar, pointing outwards instead of pointing inwards.
Thank you! That was it! Rookie mistake... Thx again!
Probably you should try to set the two arrows near the breakpoint bar to inward rather outside!
Right now your site is set as stretch to browser width.
Just click on it once to set inward direction.
Let me know if this sums up your issue, if not please attach a screenshot of your page so we can study and guide you further.
Thank you! That was it! Rookie mistake!!!