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Using a Layout Grid ─ FlexBox Grid System I discovered the horizontal alignment setting: Left and Right is rendering horizontal alignment as Center for a specified column.

The horizontal positioning for a text object is exactly the same when Horizontal is set to Left, Right or Center.
Grid system: Default and CSS Grid work correctly with Horizontal set to Left or Right.

To be able to help you, I need a DEMO project (.wbs file) so I can see all your settings.

I do not need the complete project because that will only take more time to figure out what you have done.
Basically, I just need a small project with one page and object(s) that are relevant to your question.

Note that I cannot see what you have done based on the published page (HTML), because the software has thousands of options and millions of possible combinations.
So, there is no way to know which options you have used by looking at the HTML only.

For further details about how to share a project file, please see this FAQ:
viewtopic.php?f=10&t=82134