im not seeing this issue
are you certain you have no mods
this Really does seem like some mod may be interfering
nor do i understand what you mean by “as soon as I trigger the blur event” or what that would have to do with fuel - is this some Graphics mod? if so it should be disabled as with All mods inside and out of game to test (vatsim FBW ai traffic etc should all be disconnected and\or disabled, Anything that talks to the game or modifies it in Any way)
the only other thing i can think of that might cause this would be a corrupt install file, but usually thats only a concern if you (or some mod) are editing it directly (one purpose of the addon system is to prevent the need for this)
maybe delete the official aircraft folder “Asobo-aircraft-a320-neo” and restart the game? that will cause the game to re download that package