Left position issue

Hello, if I set a popup to bottom-left position and I set a “x” number of pixel for the left position the popup will still sticky on the left margin without applying the left value.

If I will esaminate the popup with firebug the bottom position in 100px (as set before) and left “0” instead “80”. Any help? Thx!

https://wordpress.org/plugins/popup-maker/