wha??? please tell me it's not a GA thing...

It's a GA thing.

It automatically prices everything in your shop accordingly to the lowest price in other user shops.

It comes from having a Gold Account. Once a day, it allows you to price according to the lowest prices or the average prices. It doesn't price anything that costs more than 1 million, though, so you still have to manually adjust those prices.

Luckily, you can buy GAs from either the Cash Shop or user shops. :)

Moving this to Help & Questions

It's really not hard to get a GA. I usually find one for around 7 mil in user shops. If there isn't one for sale at that price right now, wait a while and look again. The price goes up and down.