ISO not staying consistent when switching through C1-C7

[NemmyTakesPictures]

Hi! It’s not been long since I’ve had my X-T30ii but I love this little thing and had it on me the past weekend everyday. This is not my first camera, just my first Fujifilm and although shooting with it is a lot of fun, there’s on thing that frustrates me a bit. 
 

My ISO does not stay consistent when switching through the custom recipes. It does not matter if it’s Porta 400, Vibrant Arizona or Kodachrome: SS and Aperture stay the same, ISO does not. 
 

I shoot in full manual and have multi set as my photometry setting. So whenever I switch through my Customs I end up with an over- or underexposed preview on the screen and end up having to readjust again which sort of doesn’t feel like that’s the point in recipes. I do get how some recipes are better in certain scenarios than others but if I really wanted to be in the moment with my subject that I want to take a picture off, and the ISO switches from 200 to 4000 on the next recipe, then that’s a bit of an inconvenience.

Is it supposed to be this way? And if so, is there a way to minimise this problem? Would AUTO ISO with aperture priority make it better?

[Greybeard]

Its difficult to see how any of the settings could cause ISO to switch from 200 to 4000 - I'd suggest you look at the different individual settings in the two recipes and find the one thats causing the difference - some settings like Dynamic Range and D Range Priority could make an ISO difference but not from 200 to 4000.

Maybe you can post links to two (straight out of camera) image files - one which resulted in ISO 200 and the other with 4000 and we could see the differences in the settings. (Make sure everything else is identical such as the lighting and the scene).