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Bug in Microsoft Word 2019 Affecting the Spacing Before a Heading 1 Style

I’m working in MS Word 2019 with Styles. When I modify the Heading 1 style, I set the spacing before at 18 pt. and I also select a page break before. This results in a Heading 1 always being at the top of a new page which I want. However, the 18 pt. before is only applied on the first page. On all subsequent pages it is less than 18 pt. I was told that this is a bug and to delete the Normal template and try again, which I did but the problem is still occurring. This also occurs when I work in a template that I’ve created myself. Any ideas how to fix this?

All I can think to do is to set the spacing before higher such as 22 pt. and then all of the pages will look as I want them to except for the first page, which is really not ideal and is not the technical solution.

Thanks for any help on this!