I thought this was useful info so am putting it over here for discussion.
Ok, trophies work like this:The bonus they give you is to increase the maximum number of training, energy, fights you have, as well as give you an equal number of units to use.So If you have a training trophy, you get an extra 5 training slots as well as 5 training units to go with it.What happened to your teammates is that they got the slots and the units, then lost the slots, but not the units. This is normal.Since your leader had used 3 previously, once the trophy was won, he had 15 slots and 7+5 units for a total of 12 units.When you lost the trophy, the units remained, but now he was down to only 10 slots again.Even though he had 12 units, he only had 10 slots, and so the excess was lost.Because you had 15 slots and 5 units, your units weren't lost when the extra 5 slots were taken away.It works this way with the other trophies too.