I created this demo multisport activity (run, HIIT, strength), when each 3 used my CIQ DF that records some data to FIT:
https://connect.garmin.com/modern/activity/8973862272?share_unique_id=24
When you open the link you'll see that there are 4 tabs: Multisport, Run, HIIT, Strength.
BUG 1 & 2: In the HIIT tab neither the graph nor the stats are displayed. (in GCM Android both stats are displayed [though not the graph])
BUG 3 & 4: In the Strength tab neither the graph nor the stats are displayed. (in GCM Android both stats and graph are displayed)
Possibly related to https://forums.garmin.com/developer/connect-iq/i/bug-reports/hiit-and-strength-activity-doesn-t-display-all-the-recorded-fit-data and https://forums.garmin.com/developer/connect-iq/i/bug-reports/multisport-activity-s-ciq-df-recorded-fit-data-is-not-rendered-on-the-website-when-switching-tabs-between-the-different-sub-activities .
This was copied from: https://forums.garmin.com/developer/connect-iq/i/bug-reports/hiit-and-strength-activity-s-fit-data-from-ciq-df-is-not-displayed-on-the-website as they ping-ponged me from there to here...