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Could it be that your wife is syncing the tasks lists used by deck to another device? Nextcloud doesn’t delete tasks from deck itself, but local task manager often have some setting to auto delete done tasks after a few days which would perfectly match the behavior you’re dealing with.
The last time I used it is about 10 years ago. Don’t miss it. Always hated the cables dangling around and pulling the headphones out of the ears. Wireless is just way more comfortable.