Lower mining rewards or is it just me?

Since the last 2 days i've been receiving lesser mining rewards per day as usual. My rig runs 24/7 w no crashes it gives out like 24-25mh, isn't that equable to at least 24RVN per day? or has the difficulty increased drastically? Or is it the pool, 2miners scamming?

Edit: Used to get around 24-26RVN per day last week. Been getting 20RVN per day since the past 2 days.