Header oversized all over sudden

Seems like you added a new header image

https://babbablog.de/wp-content/uploads/2017/07/cropped-wp.png

Yes, after the problem occured in the first place. but still, the image has been originally uploaded as 340 x 113 PNG , but wordpress always changes the resolution.

It may be your theme. Remove the image and then add it again

Skip cropping the image

This is the original image
https://babbablog.de/wp-content/uploads/2017/07/wp.png

Just tried it, still almost automaticaly crops. Any other thing I can do ?

Oh and thanks for your help, this is so appreciated!

Speak to the theme developers – they can help

OR

Create a child theme, modify the header file and replace the code where is displays the header image with the image