Cannot create new screens, however <16 created

So I have 2 screens … 6 one one, and 3 on the other … tried to create another row of 3 on the second one and the system says I am out… but the math doesn’t work. I DO use this laptop in another situation where there are 3 monitors + the screen and have it maxed out … but don’t at this moment … so don’t know if the old spaces on the other screens are stored in config somewhere and causing this problem. Any help appreciated