A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
Not really expected, no.
What’s probably happening is that Power Pages (specially Design Studio) is “rebuilding” the page and wiping out any custom HTML it doesn’t recognize. Sync can also bring back an older/default version if things aren’t saved the right way.
It’s a pretty common issue when mixing raw HTML edits with Design Studio.
To avoid it, don’t put a lot of custom HTML directly in the page body. Instead, use templates or web files, and try not to switch back and forth between Design Studio and advanced editing on the same page.
So yeah — not normal, but also not uncommon.
Yes. Users have filed support tickets, and at least one community thread confirms Microsoft is tracking the issue.