Recently I went onto my profile to go check out that page. Yet after looking through the placements from my groups, I noticed I only had 2/7 Silver Medals?

Trophy Case - https://prnt.sc/scmyfz
Corps - 0/7
IP - https://prnt.sc/scmzd0 (#1, #2)
IG - https://prnt.sc/scn0h5 (#3, #4, #5)
MB - https://prnt.sc/scn0x3 (#6, #7)

You'll only receive medals from user-created events. Unfortunately league events do not give out medals.