Your story does not make sense. If you, after markets were paused, did not touch your position (you can’t accrue more debt but you can withdraw and sell your collateral - which is taking on more risk) then your health factor would have improved, as MATIC made considerable up movements and never “wicked” down to a price from which you would’ve started, considering the time of stable coin market pausing.
So it is very likely that you withdrew and sold your MATIC as it was going up and your health factor declined to a point that yesterday’s wick from 0.858 to roughly 0.765 caused liquidation. Considering the price of MATIC was 0.68 when it was announced that the markets are frozen tells me you took on considerable risk while you knew you were in a situation where you could not pay back or recollateralise.
You know the MAI market is not really very busy. Don’t make me look up your wallet to proof that you risked way too much here.