Capital letter in a new line

[PauloWilliams]

When I press return to a new line and type the first word of this new line, the first letter turns to a capital letter automatically. 

So I need to go back, type the first letter again, and delete the capital one. 

[Patrick Connor]

This is not a bug and is normal behaviour for any word processor or DTP application

In Edit > Preferences > Auto Correct there is an option called "Capitalise first letter of sentences" uncheck that to get the behaviour you are asking for.

[PauloWilliams]

Good. One less in the list.  

But thanks for pointing that out.