Version 1.7.4 is bugged

Hello,

I have just tested the version 1.7.4, with the PHP send function, by choosing as recipient a WP role which has only one user, a message was sent to all the subscribers that is to say nearly 200 !!! and that I also received by tens !

I sent a message to a single user, which I also received in several copies!

Would it be possible to have a previous version that was not bugged? Thank you in advance!

Lise