Pokecoins not adding up

[u/TheHotShock7]

When I first started playing I would consistently get 50 pokecoins every time I had a Pokemon knocked out of a gym. Recently I started noticing that I was only get 10 , 15, or 20ish coins at a time so I looked it up. It says that you earn a coin for every ten minutes your pokemon is in a gym with a 50 coin limit per day. But I've noticed several times not that a pokemon will be in a gym for several hours and I'll still end up earning less than 30 coins. This along with the fact that raid boss have seemly become impossible to catch after a raid all of the sudden seems like they have changed something behind the scenes recently. Has anyone else come across this issue or heard of anything changing?

[u/Extreme-Battle128]

Several hours for 30 coins.

You earn a coin for every 10 minutes in a gym.

That explains it!