header image changed after update

Hello good afternoon. Thank you for the fast supply some days ago, on another header problem I had. Now I have this problem after update, on this site. http://www.yoga-psychotherapie-haas.de I´m using the plug in "WP Display Header" and I could give each page an idividual picture in the header but also a bigger size, the original size 1000x288px. see "impressum." But this only functions now when I put the setting "user original picture on this page" Maybe it´s only a problem from the plug in, I asked them already for respons but maybe I could change a the custom.css I hope you have a suggestion. thanx a lot marga