mobile menu not on the same line

I replaced the Button Block. By:

1. Selecting the Block and from its toolbar selected Duplicate
2. Deleted the original block

Sometimes if you Copy and Paste a block, the copy stores the unique ID class of the original block.
And to it loads the original blocks CSS on the front end.

Instead of copying and pasting, make a Duplicate first and the cut and paste the duplicate.

thank you for your help!