I think there is a common problem with all .NET aspx files, I have published this very simple page on my under construction website, it has no master page nor any other plugins, only has this primitive example from your canvas js website:
https://www.archilobby.com/Test/TestNoMaster
after entering the page try to play with the one of the start/end date anchors in the range slider, you will find that the page will reload (to be precise, it will post back and my proof is: try to click the browser refresh button , the browser will confirm if you want to resubmit the form)
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