Can you check if you didn’t accidentally made a copy paste of these Idle locations, so that you actually have 3 at the same position?
If you select the area where this idle location is, you can verify in the property panel how many components are selected and if it’s correct.
Otherwise it might have been a bug in a previous version of this component. I tried to reproduce it, but the AGVs are always driving to an idle location further away when the closest one is already used