They might be refreshing the game or clearing progress.
You need to disable Steam Cloud or a similar feature to stop old saves from loading.
It seems like you're experiencing a problem with Steam cloud, and you've encountered the same issue before.
Yes, I understand. Disabling it should be the next step.
Ignore it, the steam cloud is fine...?
Also, switch to offline mode if needed.
It could also be Origin's cloud backup if you have it enabled.