Weird backgrounds when using pen toll

Hey,

I have a problem when I use pen too in Illustrator. Every time I create a line the following happens:

So every time I use the pen tool below my line a semi-transparent but colored shape gets created (on the photo it is the blue thing).

What should I do with this? What causes this problem?

Thank you really much!

F

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Community Expert

What operating system and version of Illustrator? What color and thickness is the line supposes to be?

Try Command E to toggle GPU preview.

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