It looks like Scepter was changed to be a 2-handed weapon in all of the 1.3 updated documents. It is still listed as 1-handed in Demiplane.
The advanced scepter also appears to be erroneously listed as 1-handed. The improved scepter and legendary scepter both seem to be correctly listed as 2-handed, though.
Also the description for the advanced scepter lists its versatile damage as d10, but when equipped it says d10 +4 instead.
Thank you both for the reports! Scepters should be fixed up now, both in regards to their burden and versatile damage.