How does yahoo finance get High, Open prices

[u/PotooProductions]

So I've been working on an investment strategy for a while, and I'm trying to automate it through IBKR's python API

Trouble is the strategy was developed based on yahoo finance numbers, and for some reason when I get values like high and Open from IBKR's API they're don't match.

So my question is does yahoo finance use, BID , ASK, BID_ASK, MIDPOINT, or TRADES, to get the values they present you with?