If you have a large amount of POI markers and these are in the similar direction, then these are overlapping unless you e.g. cluster them. If you search our forum for the term POI clustering you find some posts that deal with this topic. I have put some forum posts here for you but you can find even more if you search in our forum.
In general we only recommend to display a limited amount of POIs in the camera view, for UX purposes, so the user can more easily find the POIs.
While using Geo AR functionality, we are fetching location from GPS. We receive the user's location but not accurate (approx 80 percent accurate). We pass this coordinates to wikitude for placing POIs dynamically. In this case, we are seeing POI's near to each other.
Please check the below image for reference.
Also sometimes image does not loads.
Let us know if any other debug information is required.