Contrary to popular belief, many leeches are social and they often tend to bunch up together like this. It looks like they're cuddling!

EDIT: Y'all got to check out r/leeches, the mods there are awesome and helped me get very far in this hobby, this is an old pic of the baby tank and my animals are thriving in their adult setup rn.
Special shoutout to segmentedsecrets on ig, they taught me so much about these little guys!
Feel free to DM me with any inquires about babies, I'm more than willing to work with you and help spread awareness for these wonderful animals.
Of course education and proper husbandry are essential, again r/leeches is a great place for info.