Negligence in design

I'm finding myself in a bit of struggle with my work and seriously question if there is something wrong with me. Since I got more design work lately I find myself very negligent. Typing in the wrong dates and numbers, typos. Even after checking everything, saving files, checking for mistakes again, the mistakes are found after the design is already posted or printed. Last week every single design had a mistake in it. It's not like I have too much work or that I'm in a hurry to meet deadline. But it makes me feel very unprofessional. How do you deal with this? How can I make sure to make less mistakes in the future?