If you display the TOC field code, what does it say? Press Alt+F9 to show/hide field codes.
Chances are that Heading 2 isn't mapped to the TOC 2 style (which it is by default) but to some other style. Its formatting will then be controlled by that other TOC style.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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