These people may be trying out different online dating sites in order to find the right one for them.
It is always a good idea to diversify so as to increase the chances of the right one finding you or vice versa.
You never really know what online dating site is right for you until you have tried a few. This may be why you keep finding the same people across multiple online dating sites.
It doesn’t hurt to try something different when it comes to finding someone to date or a relationship partner. Perhaps you haven’t been having that much luck with meeting someone to date in the real world.
You may have a really busy schedule that has made it difficult for you to meet potential dates or you may simply not be in an area that has a lot of opportunities to meet potential dates.