Large price difference on Binance Auto-Invest (Convert) orders — is this normal?

Hello from France,

I’ve been using Binance’s recurring plan by means of the Convert function to automate my investments for a couple of years now. Nevertheless, I just lately observed that the executed buy prices are significantly larger than the actual market worth at the time of the transaction.

For example, considered one of my BTC purchases was executed as we speak at 14:04 CEST with a fee of 1 BTC = 109,140 USDC, while the precise market worth at that actual second was closer to 108,500 USDC — a difference of about 0.58%.

I perceive that there’s all the time some unfold involved, however this seems quite giant for such a liquid pair.
Is this regular conduct for Convert-based recurring purchases on Binance?
Would I be better off using a extra conventional strategy by way of spot buying and selling to avoid this type of discrepancy?

Thanks prematurely!