Wellness CORE Grain Free problems, anyone else?

Hello! I have been feeding my two cats Wellness CORE Grain Free Indoor formula and Kitten formula dry food mixed together (supplemented with wet, I need to feed them that more ik) for years without problem... no throwing up, no farts or loose stool.

Thing is these last two bags I bought them a week ago seems to be making both of them occasionally vomit shortly after feeding (one of them does once a day I'd approximate)... they also haven't really been finishing their portions entirely, which isn't unheard of but I wonder if they know the food is a problem? I can't find any information about recalls, there wasn't a big diet change between bags... at a loss of what could be causing the problem, should I contact the company?

I plan to not give it to them tomorrow or the next day, instead they'll be getting their regular wet food Wellness Natural Grain Free minced chicken. See if they have improvement and go from there.

They are not lethargic, irritable, hiding away, or behaving abnormally in any other way. They've been very playful, diligent when grooming, and cuddly like always. I keep a close eye on them, at home 24 hours a day most days... so I hesitate to say it's any kind of actual illness.

It's hard to say, really. Any possibility they're scarfing and barfing? (eating too fast?) How old are they? I think feeding more wet/less kibble for a few days is good. If you can isolate the problem to one of the kibbles then stop feeding and change to something else.