Moving/deleting mail with gnus (nnmaildir)

[Kamil Jońca]

I have maildir folder with a lot of mails (say 10000)
With gnus I select 100 first  mails (i.e. <Space> -100 ), read 2 of them
and  98 move to another folder (another nnmaildir group)
Then I exit (q) from group, and select again 100 articles, but with read
articles (C-u <Space> -100) and gnus select only 2 previously read
articles. Looks like it remember some info about deleted/moved
articles. I expected that gnus show me 2 read, and 98 other
not-yet-deleted articles. Am I missing something?
KJ