Hi @Arlen, welcome to the Forum!
I’ve moved your post from the random thread it was on to a separate one.
The screenshot you’ve posted shows the opponent’s Defense team, not the team they used to attack you.
They’re intentionally putting up a weak team in order to lose Trophies/Cups.
This is commonly called “cup dropping,” and is a simple technique to get easier matchups when attacking, by reducing Trophies.
There are many threads on the Forum about it, which you can find by searching.
A few, for starters: