Yeah, the tooltip says 25%, and the value provided is 1.25. However, for the essence bonus stat the game treats the value as the actual percentage boost instead of a multiplier (like, if you have 16 essence and you multiply by 1.25, you will get 20 which is a 25% bonus). Since it does treat it as a straight percentage, it just adds 1.25% bonus to your total. Shards list the bonus value correctly, the temple does not.