I did fall into that trap of closing and reloading the slot and it went from 0.25 to 2eur stake and took a number of spins before I realized it was on 2.00 stake.
other providers such as pragmatic play remembers the stake last used, even though when you open a pragmatic it opens with a 2.00 for the very first time you play it but after that it will remember it when you play it in all future sessions.
noticed with 7 shields of fortune if there is no win potential on the screen then it doesn't do any connect&collect animation but with Cai Fu it still does it even though there is no win possible...
and with those add wilds so often it pays nothing on those and when its dishing out the wilds it can land a wild on top of another wild.