Hi @Christoph34, this thread is mainly intended for discussion related to adblock-lean development. For support/questions about usage it would be better if you posted in the main thread. Also please include console output and explain what you mean by "same number as before". I think what you are observing is the fact that downloaded and pre-processed list parts have in total a higher number of entries than the final list. If so then the reason is that by default, adblock-lean eliminates duplicate entries when compiling the final list.
(BTW @Lynx I just realized that we are running sort -u regardless of the number of URLs, even for one URL where it probably makes no sense?)