@vunguyenhung It will not help, I’ve created 8 new RSS sources yesterday and few of them pushed all info found there as new events today.
And if fix will be based on recreating of all RSS it will be aughfull as i have more that 140 of them.
Maybe this info will be useful but i reported similar issue on Sep '22, it have been like that for few days and after that it have been fixed on it’s own.
Here is old tread Getting an RSS feed to only pass the newest post to the next step