Dropped 5 pages

[RG83]

Hi all,

I have a question and was helping you'd all be able to help with,

We are using wordpress

We had a ecommerce store which was on page 3 on Google,
we deleted a lot of product pages in one go and also added a fake review app,
with in a day of doing those things we dropped from page 3 to page 8 on Google literally overnight,
does anyone know if doing either of those two things could cause such a dramatic drop in Google pages?

Thanks in advance for any help, it'll be greatly appreciated.