When the numbers do not match
Your figure and the exchange's rarely disagree because one is wrong. They disagree because they measure different things. These guides take those differences apart.
About these guides
Why does liquidation use the mark price?
Liquidation is judged on the mark price rather than the last traded price, so that a momentary wick on one venue cannot trigger mass liquidations. The low on your chart can sit below your liquidation price without the position closing, as long as the mark price never got there.
Do these apply to every exchange?
The mechanics point the same way everywhere, but the parameters differ. Wherever a section depends on tier rates, a maintenance amount or whether closing fees are included, it names the venue it describes.