What’s with the Californian safety warning on TKMaxx products?

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I’ve seen these warnings on a number of TKMaxx products - something like “the state of California warns that this product contains something that is known to cause cancer”.
the latest is a bin - pic below.

I know TKMaxx is an american company (TJMaxx, I think) and can see how their stock would end up here but what is going on with these warnings?
how worried should we be?
should we have the same standard as California?
does everything potentially cause cancer?

It’s not only tkmaxx/ tjmaxx. It’s most products that are also sold in California