Hey Andreas,
Adding the hashtag to the URL is the default behavior of a Jump Link. Before, like other themes, we did not include the hashtag. We later realized that it’s important because if a website user wants to save the section of your page, without a hashtag, s/he won’t be able to go back to the section easily. S/he will have to inspect the code and copy the ID of the section. We just restored the default behavior of the browser. We just added the scroll animation and header offset.
Please visit the links below to know more about the Jump Link and its benefits.
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If you still don’t want it though, feel free to have your developer override it. We don’t have the code for that and please just note that we will not support issues that arise from customizations.
Thanks.