There is this new hype around the defi things and so forth which means that gas fee's are higher but also they are a lot more volatile as well, they are moving around like crazy and one moment it shows that you should pay x amount of gas fee but in reality it is increasing like crazy behind the scenes so when you pay what you "should" pay it is increasing like crazy so the price goes up insanely high and yours stay behind because it was the bottom when you sent and now it is much higher.

This means that if you really want to make a change you should always pay higher than what you should, I use metamask and not mew but I always pay higher, that way I am always ahead of the schedule even if it goes up, because higher means even if it goes up that way I am still at the middle instead of high.