October Update and my mistake in investment

I have bought more ETFs in September - ASIA and VDHG, also topping up my existing ones. I made a mistake while buying VDHG. I was experimenting another trading app - Commsec to check on their live update of prices. So while I used that $ to place order in Selfwealth, selfwealth price was actually not the same?!!! It's my fault for not checking the price on selfwealth before clicking the order button. I ended up buying 60 cent more than market price on selfwealth platform - which means I lost money the second I placed order. 💀 🔨