why the sub-page index disappears?

seo gosu said:

I bought an expired domain and created a homepage. by use checking index search site : ~~~.com. A total of 14 subpages were indexed in the week of creation. However, it decreased to 4 three weeks later. What's going on? Is there a problem with the expired domain? The site is still being indexed. and The search console says it's an index

anyone know this problem?

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