Problem with longitude and latitude

First of all, thank you for creating the plugin.
I want to add the plugin to my site with a shortcode.
Now I have a problem with the custom location.
I enter the correct longitude and latitude, but the displayed location is about 100km away.
My location in Germany is 01844 Hohnstein and any location in the Czech Republic is displayed.
Where could my mistake be?
[ventus width="100%" height="600px" radius="20px" lat="51.027325" lon="14.213932" zoom="4" layer="wind" scale="C" units="knots" pressure= "true" marker="true" forecast="true" time="12"]
Thank you for the support!
Christian