I suggest reviewing the swgoh.gg later if you want to see what worked against your defensive squads. There could be a number of reasons. If squads with poor mods and missing zetas (important one’s - not all are vital for counters) are clearing your defensive squads it’s important to try to understand why so you can improve your defence. It’s hard for us to pinpoint a potential issue without seeing the matchup and swgoh.gg data. There is the potential you were out matched by roster depth by a poor performing player (it’s why larger rosters who are active can slip down until their depth wins the battle). So their roster may be poorly modded and invested but have the options of more powerful squads which would squash early game squads.