Why do bra straps keep slipping Off the Shoulder?

A woman's upper body, with a bra strap falling off her shoulder

EIMGO Silicone Bra Strap Cushions Holder Non-Slip Comfort Shoulder

How to Keep Bra Straps from Slipping Off Your Shoulders – I Am Sew

Easy hack to keep bra straps from slipping off your shoulders

I tried 6 slipping bra straps solutions and here's which ones

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How to Keep Bra Straps from Slipping Off Your Shoulders - I Am Sew

How can we stop a bra strap from slipping off the shoulder? - Quora

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How to Keep Your Bra Straps From Falling Off Your Shoulders

Slipping Bra Straps? We Can Help - Why Bra Straps Aren't Staying

This is how you get the shoulder straps on your bra to stop