filter is linking to https://www.wpcarmanager.com/kb/listings-page/

I tested this nice and easy plugin but have some issues:
1.For some reason my Filter bar is full of hyperlinks to https://www.wpcarmanager.com/kb/listings-page/ i.e. If I Click Choose Model is opens a new tab to this. Is that a settings somehow?
2. I the back-end is English and the browser (or OS?) is Dutch the pages are in dutch (which is fine) but the permalinks are not working, in the backend it says /vehicle and on the site /voertuigen. Make the backend also Dutch and resave permalinks corrects this, but what if use different languages for site contributers and visitors?
3. The layout carlisting in the backend: the columns Type and Title get as narrow as 1 Char if you don’t use full screen (FHD) or if other plugins also insert extra colums (SEO, Analytics…) Hardly useable then.
4. I’ve seen it already requested before; to be able to add Moto’s and why not boats… Maybe an extra Post type can be a solution here?
5. I tried it with Divi Theme, I noticed I need to turn off post image in divi otherwise featured images shows twice.