Within the last month or so, it seems WDQS is returning reduced precision for the coordinate values (lat and lon).
Please refer to the following query to demonstrate the problem: https://w.wiki/8Sa
The Wikidata item in the query has the following value stored:
Latitude = 14.025777777778
Longitude = 121.59183333333
Precision = 1.0E-5 (or 0.00001)
Note: This seems to only affect recently-edited items (even if none of the coordinate values for the item has been touched). Old items give the correct precision but newly-edited items have the reduced precision.