Cells appear below each other everything ?

Hello There,

im integrating a new template in WordPress from scratch. The template has a Default CSS Style. Once i start building the page with the page builder even if i put 3 columns in a single row those 3 columns always appear below each other ? Can someone tell me what could cause this ? When i take a look at the Computed CSS Size for each column block is 1140 px. If it means anything the template css is organised to be displayed as table. I was also not able to find the inline css that the Page Builder has generated.

I’m looking forward into your help what could be the cause.

Kind Regards
Dev