Yes. Jumping the border is a misdemeanor if you don't immediately self report to request asylum.
But the majority of people getting rounded up right now are for unlawful presence.
And a lot of them have no idea that their presence was marked unlawful until ICE gets them. There's a reason civil offenses are supposed to be handled with proper notification and court summonses instead of this shit.
Overstaying a visa is a civil offense, 'improper entry' e.g. jumping the border is criminal.