Sometimes when I see frequent misidentifications that don’t make sense (species that the CV should know and are reasonably visually distinct), it turns out that the problem is not the CV suggestions, but a common name that is causing confusion – people are choosing the name they recognize and don’t realize that the organism they are selecting is actually something else.
Another issue that can be a problem with some groups is that way taxa are selected for inclusion in the CV can result in the CV no longer recognizing a genus that it formerly identified correctly. This is because once a species in a genus is eligible for training, the CV will no longer be separately trained on the parent genus. If (as often happens with bees) the only species included in the CV is one that is untypical for the genus, it ends up suggesting everything except the correct genus because the typical species are difficult to distinguish and have often been left at genus level and are thus not included in the training set.