Hi
I am not sure that I fully underatand your message.
When it generates the filters, there are some random things appearing from nowhere with nonsensical settings, and on top of that
What are these nonsendical things?
Regarding the "Re-indexing" message, probably this occurs because the indexing never finishes due to an error.
If possible, check your error logs for an error related to Smart Search/JFilters indexing. Otherwise, you can provide me an admin account to have a look.
Is there an option for manual addition and setting of filtering without imposed filters?
If you mean to create your own filter based on some arbitrary data, no it is not possible.
JFilters automatically creates filters from your system's custom fields, categories, tags and some native fields like the author and the creation date. If you want any filter beyond these, have to be added by coding, which will have an extra cost.
Kind regards,
Sakis Terzis
Founder and Lead Developer