Could it be because of the trading hours? Probably yesterday  midnight over there.

Also for US denominated ETFs if you're buying and holding long term, gotta watch out for estate tax (on your demise) and also dividend withholding tax (for distributing ETFs) since Malaysia doesn't have tax treaty with the US.

I personally go for the Ireland denominated ETFs route.

Edit: since it's via FSM, make sure to check the fees also in case of dividend distribution. Don't know about FSMMY but last time when I used FSM HK for USD holdings, after all the fees I essentially got almost nil dividend (and that was the triggering point of me jumping into the whole IBKR route)