If you paste multiple lines of text into a cell, Calc's AutoCorrect will change the first character of the last line to uppercase:

foo  =>  foo
bar      bar
baz      Baz

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

To fix this, go to Tools / AutoCorrect Options, choose the Options tab and uncheck every box. You're a programmer, you don't need wimpy AutoCorrect assistance.