I’m so Frustrated. Why are My Photos SO ENORMOUS on Facebook?

I have searched the internet for hours and can find no answer to this question. It's like I'm the only person in the world who's having this problem.

I'm going to place the link below for my business page of FB. What the heck am I doing wrong? Why is FB displaying my photos the size of The Jolly Green Giant? And how do I fix this?

https://www.facebook.com/Charmed-Life-Picks-189757098240049

Good Lord, this is maddening.

Thank You.