Button Rollover: Partial Trigger Only

I am using Captivate 2019 Version 11.5.1.449 on Windows 10. Sometimes, when turning smart shapes or SVG icons into buttons, only part of the button is clickable. (usually only the bottom portion of the button) This is strange to me. Anyone else have the same issue and more importantly know of the reason and a fix? It works fine on Preview and HTML preview but after publishing and view through the index file within the zip Thanks!