I'll start replacing the converted shapes with real text again, and see if the issue still persists. Thanks for the advice, Acorn.
Btw, the page movement issue has been resolved. The Xara team suggested exporting the site with the "Scale to Fit" option checked (found under Web Properties), and inputting a value of 1920. This worked, even when increasing the value to 2560 to match the resolution of my desktop monitor.
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