We are capturing 100's of drilling sample locations in QGIS. At times, we are copying the whole set of points from adjacent survey_lines to the next one. After that, we will capture the respective mineral values. But once we save it and open the shapefile again, the points are getting displaced randomly (but not all the points), just like in the image.
Actual values are 110,20,15,20,30 etc... But the respective points are displaced to some other place and had been replaced by some other points. One can see captured values (yellow) doesn't match with the actual values (black). Will it be a bug or due to any plugins or due to copying - pasting of points or any other thing?