Help with hashrate! trying to switch to zen mining


I love the zen cash project and i’d like to be a part of it!
I am a bit confused on my hashrate.

Currently I am mining Zcash with a R9 280x with claymore miner.
I am getting about 265h h/s.

when i switched to ZenCash my hasrate dropped to 80 h/s…same miner and same config

is this because of different hashing algorithims?
or is the problem on my side?