My iPads "System Data" is 35 GB

I just bought a new iPad and restored it from a backup from my iPhone, however the storage is already full because the System Data category is almost 35 GB -- more than half the storage of the iPad! I have tried clearing cache in safari, offload unused apps, syncing it with my Mac to clear analytics data, and basically every trick on Google, and the system data has not reduced at all. The iPadOS is up to date.