Can someone explain the phenomenon of terrible handwriting?

Note that zombies have bad handwriting; this thread was last active almost a decade ago.

This thread was revived by a serial spammer, now gone, who had handwriting on their mind and made at least 7 posts in 7 threads before being zapped.

I can’t write in cursive anymore except for my signature. I can print really good but all upper case. I do crossword puzzles everyday.

I can print o.k. but my handwriting is terrible. I have no idea why. My Mom had the most beautiful writing, and my little sister has beautiful writing. Me, I honestly practiced for years to try to improve this, but I never could. I am left handed, and have even tried writing with my right hand.

I had a decent education, and my little sis dropped out when she was like 14 years old. Despite this, she has beautiful penmanship, and I just don’t get it. I guess you just never know.