Sending Send List! 6 emails with same content

Hello there, I just tested the Send List! I received 6 emails with same content i couldn't stop sending mails until I bak to the site and removed all favorites. is this is a bug we use Joomla 3.7 and PHP 7.1.
We use My Shortlist 1.7.243

Please let me know if you need more info!

Hello and thank you for posting.
Do you have more than one module instances on the same page?
Could you please elaborate a little on how the problem started and how it ended?
Thanks again.

Hello, No I used just 1 module, it's simple I just tried to use send a test that's gos to a friend not admin! So i received 6 emails in same min. But now I did one more test with turning off (Use Ajax if possible). So i got just 1 mail. Now it's worked fine.

Ok, thank you. Then I will check its stability with Ajax.
Please let me know if you need any further assistance.
Thanks again.

I sent this my mail to you already!
One more question or future request is a plugin where to add button in same line where the print and email icons on contents, this will be great and very useful component for users. See example screenshot from attachment. Alternatively, could you give me the code to add it in com_content to have this feature?
I really appreciate any help you can provide