Re-sizing images in posts

Greetings WordPress Friends,

I am currently running my website – https://www.weareallmachines.com – and I am running it with the WPZOOM meeta theme.

I’ve recently been finding it difficult to re-size images in this theme. For instance, when I open up a post and add an image, it will first appear in my post under defined dimensions (600×600, 300×300, 150×150), which ever you choose. If you want to change the size of the image, the theme allows you to go into the advanced image settings. Once there, you can either scale it up or down, percentage-wise, or you can edit the pixel-value manually. The problem is, the image only appears edited in the post on the wordpress admin, and will NOT appear edited with the same dimensions at the website. I have also tried editing the image dimensions through the html editor, but again, it will only make the changes in my post on the admin and not on the website.

Has anyone ever experienced this issue or have any suggestions on how to make my images appear with my defined custom dimensions?