Well if the sites have been filtered using GSA Platform Identifier, then there shouldn't be any "no engine matches" but you can get "wrong engine detected" as that is checked later on in the submission process that GSA PI can not check.
double click on that entry and check if it's still e.g. a DokuWiki site or an error.
I am scraping on my own and sending GSA SER Links after passing through the GSA PI
Do I need to make any special settings to avoid this kind of error?
Or is it normal?
Or maybe that is not a good idea since "wrong engine detected" simply means that GSA PI could have sorted a link into multiple platforms, so one of the platforms could be the correct engine to USA in GSA SER
Here are some examples from log with "no engine matches" error:
Do you know, what engine is it with /bbs/ in url? I think, it's better to uncheck it in project options
UPD: Already found, it's GNUboard
Article - GnuBoard..........: 3
Blog Comment - General Blogs: 2