Some Teachers may see old pages appear at the moment of editing their sites using School Loop Standard. This can happen even after the school itself has upgraded to the new SLS2 site version.
With the objective of minimizing any training necessary for the teachers, School Loop maintained the original interface for user sites, so they can keep working as usual. Assuming their school has converted and published on SLS2, they need to manually convert their user site to SLS2, which requires just a few clicks.
After performing the conversion to the new version, your site is displayed in the SLS2 design.