HMR is appending instead of replacing

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this is my initial load of my page:

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after ich change some text the HMR get fired up, but appends the DOM instead of replacing it:

enter image description here

does anybody have a clue what could cause this issue? there are no errors on console.

Update:

i used the ASP.NET Core with Angular Template from Command Line. This Template uses bootstrap and jquery. I would like to delete both components hence i want to use material

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