Currently the Semantic MediaWiki version on WikiApiary is 2.5.6
This version of Semantic MediaWiki has a few issues,
- Sorting by random returns variable number of results #3788
- Different # of results returned when limit is set to 250 vs when limit is set to 500.
The latest version of Semantic MediaWiki (3.0.2) supports MW 1.27.0 - 1.31.x so there should not be a need to update MediaWiki on WikiApiary.