Hints disappear on Android

I’ve tested in several mobile browsers and it’s working as expected.

Could you tell me phone model and browser version you’re testing it?

Also, please give me a live example of the site you’re using that.

On Kindle Fire using Silk:
Tap the hint, the text disappears.

On Motorola Xoom using ICS and Chrome:
Tap the hint, the text disappears.

On Motorola Xoom using standard browser:
The hidden text just shows.

Example page: https://collegeofcuriosity.com/object-65-melted-metal/

Thanks,

Jeff