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Editing the email templates in 1.7.6 is a bit...... well.... adventurous....

One sure way of changing all the email logos is:

make sure you have the logo in the size you want for the emails, upload to server -

go to your email directory e.g. classic

/mails/  - go to /themes/modern/components/

edit header.html.twig

look for:

....

<a href="{shop_url} target="_blank">

<img height="auto" src="{shop_logo}"

.....

change to

<img src="http://server/path/img.png"........

check the "height" in the next line.

Should do the job,-  without getting 'random' changes.