They don’t want to become the next job you leave in less than a year, and right now your resume says pretty clearly that they will be.
Having a stable work history and good references is a prerequisite for most jobs, and especially so for interesting, challenging jobs.
The second longest is a year and a month, 2012-2013 for a security company. I blame my personality type, INTJ, and quit most positions without having another job lined up, so I have a lot of gaps in my employment history as well.
Most employers rightly believe that a person’s past actions are the best predictor of their future actions, and so your professional past counts for a ton in the hiring process.
You’ve built up a past that’s now functioning as screaming warning sign employers.
I have short work histories with previous employers (10 or more in 7 years).
The longest I’ve worked for a company has been about year and a half: Dairy Queen when I was working in high school.
However, as time progressed, I found in my own therapy practice that, indeed, there exist some individuals on this planet with narcissistic challenges.