[Jiaz]

Original Hoster: for example share-online,rapidgator,uploaded
Multihoster: alldrebrid, real-debrid, smoozed,premiumize....

When downloading a file via multihoster that serves *different version* of the file, then crc check will fail because the file might be different than then one from original hoster.
You can easily add extra bytes at the end of a RAR/ZIP without breaking the file but it will change hash/filesize of the file. That's why the original hashsum of the file no longer matches and JDownloader shows error.

That's why I'm asking if you are using a multihoster or not.