DeepL Translator says:

Many a difficult problem I have
Examining in the tomcat heart
Already pondered and fathomed.
But one remains unsolved for me,
Unsolved and incomprehensible.

Why do people kiss each other?
It's not hate, they don't bite each other;
It's not hunger, they don't eat each other.
S'can also not be a purposeless blind
Lack of understanding, because they are otherwise
Wise and self-confident in action.
Why, then, I ask in vain,
Why do people kiss each other?

Why mostly only the disciples?
Why these mostly in the spring?
About these points I will
Tomorrow on the gable of the roof
A little closer meditate.