Teaser count wrong number of images

Hi, thank you for your plugin.
I just wan to tell you that on my case, plugin count images in a wrong way.

I mean for example from one of my post
(1916 words, 8 images, estimated 7:40 mins reading time)

words: correct
images: sign 8 but in real are 4

I checked in all my post and I see the plugin makes this in every case.
It sign the double of real quantity of the images.

Do you have a fix for this.
Thank you very much.

https://wordpress.org/plugins/post-teaser/