Why big difference in price when buying and selling a stock

Basically when I buy a stock I check live price on few different platforms, one of them is Yahoo so when I put an order freetrade always executes at a higher price and same for selling always at lower price? I just put an order and difference is 20 cents, that’s a lot of money when you talking about thousands of shares.

Thank you for any replies.

https://community.freetrade.io/search?q=spread

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