WordPress header setting breaking website

Yesterday I migrated my wordpress site to a new server. After a few hangups with the sql database, the site was up and running with no errors – everything looked and behaved just right. I sign off, thinking my work was done.

Today I visit the site and the header and background image is totally broken. I did nothing after seeing everything in good order yesterday. I’ve updated wordpress just in case, and also tried switching to another theme and back. The background image is ‘kinda’ working now, but the header is still screwed up.

Any ideas? This is supremely baffling to me! The address of the site is:
https://wmbrezinamusic.com

With the header off, things look basically normal (but not header) – I’m turning the header on, with an image of 600px100px, to show how it looks huge on the site.

Thank you for any help!