Error & Duplicate Code in Header?

as you can see this problem is not specific to me, do you see the same problem with other functions ?

Sorry to bother you. No, JCaptions in the only remaining error. Previously had multiple error, likely caused by duplicate jQuery instances, but JQuery Easy plugin has apparently sorted that out.

check your source code, you will see what I mean
yes in your console the JCatpion is the only error remaining and this is not related to maximenu

you can try to unpublish maximenu and see in your source code if the JCaption is still called and if you still have the error.