I don’t know about two weeks ago, but over the last three or four days it’s been a known platform issue and many people were affected by it. There are already several threads about it in the forum.
You can see the official status here:
And discussion in the existing threads:
New SmartThings App now completely broken (Outage 14 Jan 2021)
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Um... what happened to my automations? (Outage 14 Jan 2021)
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Tiles keep shuffling in app
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[help needed] app lost rooms unable to show devices