It appears you are using either RevSlider or LayerSlider which I am actively trying to persuade both of their developers to make changes to their plugins to allow better compatibility.
You see they both use Greensock Animation Platform(GSAP) same as us(best on the market). But they load all that JS and some other JS plugins inside a custom single file.
By doing this they make it so that Popup Maker and any other plugin cannot detect that they are already loaded and end up loading multiple copies of the GSAP resulting in JS errors which means sliders and popups fail to work.
You make the 5th case ive seen so far in the last 3 weeks, but I haven’t gotten any movement out of them yet. They said updating to the latest versions may resolve the issue and I have mixed results. In several cases that worked though.
But that is not a proper resolution and I will continue to try and work it out with them as this will just continue to happen, on top of the fact that you will still be loading 2 copies of GSAP as well.