Shortcode column issue

I am having an issue with shortcode columns. I can not get my [on_half_last] column to actually go next to (horizontally) my [on_half] column. I am also having issues with my fourth [one_fourth] column jumping down to a new line as well.

Can you please help?

URL: https://leancor.com/resource-hub/

The “Webinar…” section is the section that should be next to the first image.

Thank you!