People in both the North and the South didn’t like parts of the Compromise of 1850. The Compromise of 1850 allowed California to join the country as a free state. That wasn’t popular in the South. The Compromise of 1850 also ended the slave trade in the nation’s capital. That also wasn’t popular in the South.
There were some parts of this compromise the North didn’t like. The Compromise of 1850 allowed people to decide if land in the Utah and New Mexico territories would be able to have slavery. This meant several new states could possibly join the Union as slave states if people wanted that to occur. Plus, some of this land was north of the 36° 30’ line that had been closed to slavery. Now, some of that land could possibly have slavery. The North wasn’t happy with this. Additionally, the Compromise of 1850 required northerners to help capture runaway slaves. This was part of the Fugitive Slave Act. Northerners also didn’t warmly receive this.
In a compromise, both sides get some of what they want, but not everything they want. This is what happened with the Compromise of 1850. Therefore, it isn’t surprising both sides were dissatisfied with parts of the Compromise of 1850.