Could I know what could affect this?
As far as I know, I didn’t add any php code that could affect this.
or prvious setting could change it..?
I am using the woocommerce-cart shortcode.
I found woo block is too slow to be loaded, so not using it now.
I am not sure.
There have been some recent updates to Woocommerce that affected the Quantity selector option.
And it may have been one those changes that affected it.