Quantization i n c r e a s e a s size of the file

Hello there,
I am now learning TFLite (using a book ,TinyML: Machine Learning with TensorFlow Lite on Arduino and Ultra-Low-Power Microcontrollers") and I have a problem with quantization.
It increases the size of my file!
Does anyone have any clue, what may be causing it?
Link to both of my projects:

(first - sine - 1:1 as in the book. Second one - cosine - I tried to apply what I learnt independently).