I used QGIS topology checker for parcel data of an area in QGIS 2.18. The rule used was- 'Parcel must not have gaps'. The result showed many error (gaps) and while zooming in and zooming out, the results are different even for a same area i.e. while zooming out and validating topology- no errors are shown in a place and if zoomed in and validated for the extend- errors are shown at that same place. Why is this happening?
Interesting thing is- no topological errors was shown for that area while using topology check of ArcGIS. The rule and tolerance level used was same for both cases.