Hello,

So assuming you're running the same difficulty in campaign as before, as well as trying to level up the same amount of champions as before too, the most likely explanation I can think of is you had an XP boost active that has since ran out. 

Thank you for the feedback, but if the XP boost run out, then coin gained should be the same right? The problem is the coins earned is higher than before. Ok, I will try to buy XP boost with diamonds I earned from minning when this happened again. If it is because the XP boost then I used too many boost? We'll see. 

Thank you any 

No worries.

The silver amount is unrelated with the XP boost, and remains the same, assuming you're doing the same stage and difficulty over and over again. However if you're including selling the gear that drops from 12-6, the amount they're worth will vary depending on rank and rarity.

Isn't  the  amount  of  XP  split  between  all  the  champions  that  can  use  it?  So  that  would  mean  running  less  champions  may  get  you  more  XP  for  a  specific  one.

This was one of the things I was curious about too. In theory there are a few reasons an earlier game player could get a bit confused in regards to why you're getting a certain amount of XP or silver. 

That is indeed the case. But the fact that the XP is split among all champions makes it ineffective to run teams with few champions - assuming your campaign farmer is maxed allready.

Maxed campaign farmer + 1 other champ = 50% XP wasted to the farmer.

Maxed campaign farmer + 3 other champs = only 25% XP wasted to the farmer.

I  was  just  wondering  if  the  OP  might've  run  different  amounts  of  champions  on  different  difficulties.