WordPress is resizing GIFs resulting in poor quality

The GIF images in my posts look bad, especially on mobile.

I see that they are kind of resized because their URL looks like that:
https://i2.wp.com/blog.com/wp-content/.../image.gif?zoom=2.625&resize=300%2C180&ssl=1

instead of:
https://i2.wp.com/blog.com/wp-content/.../image.gif

It’s strange that the resizing is made while the page is rendered. I mean the GIF looks good in the very first second you see it, but after that, it gets resized.

I don’t understand what’s with ?zoom=2.625&resize=300%2C180 since the GIF is already at its original width/height.

Do you know how can I block WordPress from resizing the GIF images? Thank you!

The page I need help with: [log in to see the link]