I am currently working with a shapefile made up of multi-part polygons symbolizing zoning areas. Geocortex is a web-based service used to display your data. When I click on a larger polygon in ArcMap the polygon highlights neatly along the lines as a selected feature should. When I do the same through the Geocortex web-based data viewer, the polygon selected highlights from random points - creating triangular connection points - and not the line represented. I'll show an example in the attached image.
If anyone has experienced this issue, then how can I fix it?