Did not display properly because of the % sign

Hi im a beginner in php.

In this link , each of the % sign append a number 25 at the back and make my web have an error because it did not display properly. is there any possible my php code have an error?..

A7WQyhVZ7rSub%252BvS390vDY61224DdnDtBbeLJYctKyE%253D

the correct value should be like this A7WQyhVZ7rSub%2BvS390vDY61224DdnDtBbeLJYctKyE%3D

Thank you so much