1
vote
Most probably it happens because of the Align to Pixel Grid option switched on, as per comments. Try to disable it and see if it changes anything.
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Enisio
commented
Can you try without this place selected?
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Lance
commented
Francesca,
You have Align to Pixel Grid switched on. See the attached screenshot of your video.
Click that off and try again, you may have better luck.
A word of caution though, sometimes Illustrator's 'smart' guides and snapping don't work as well as we'd like so you may still struggle a little bit.
