Hello! I checked out the prototype from Anthony’s post on iOS, and it does look like the whole page will slide with the slider if your finger is partially touching the slider and partially sliding the page. It doesn’t look like this happens on Android, but may be related to how you can swipe the page to move back and forth between pages in the browser. Are you seeing this happen just in the Safari browser, or also the Axure Share app?
For creating the illusion that the slider is filling with color, the post below should help:
And the one below has an example that lets you type to change the position of the slider:
