Comment spam since I use AnsPress

For some time, I have a lot of comment spam on my site and I did not know why. Because I use Akismet and have safe settings.

My discussion settings are the following:

E-mail me whenever
[YES] Anyone posts a comment
[YES] A comment is held for moderation

Before a comment appears
[YES] Before a comment appears Comment must be manually approved
[YES] Comment author must have a previously approved comment

However, all comments will be published without my moderation or an E-mail to me.

And now I have noticed that it is related to the use of AnsPress plugin.

When I disable the AnsPress plugin, then the comments must be moderated again and I get an E-mail.

And the user gets the notice “Your comment is awaiting moderation.”

But is the plugin enabled, comments are simply published.

If it helps, here is a history of such an comment:

1 day ago (Fri 28 Nov 2014 @ 01:34:11 am GMT) – Comment status was changed to 1
1 day ago (Fri 28 Nov 2014 @ 01:34:11 am GMT) – Akismet caught this comment as spam

And I am using AnsPress 1.4.1

Has anybody the same problem?

Best regards
Manuel