One problem with your slider is images become horizontally compressed (distorted), as can be seen when you squeeze a desktop browser. Acorn's fade-in fade-out slider in this thread works well, but if you could live with a "crossfade" transition, you could create a slider as a separate website and embed this into your main website.

Here is an example: https://initiostar.co.uk/demo/pan/index.htm. The upside in this example is the website slider can have a mobile variant which will correctly display in the main website with little additional effort. Automated transition for the slider has a number of options, but can be just one line of code.

On the Forms issue, Acorn showed a solution for having just one copy of a form that works across multiple variants - Jot Form example here: https://initiostar.co.uk/demo/formtest/-. I cannot tell whether this helps or not, but you could first remove the slider which seems to be causing an issue and check the outcome.