In this article you can read why should you stop all Facebook campaigns when you order likes.
If you have a Facebook campaign running, then page likes can come from that. The moment we start delivering Facebook page likes we look at the counter. As an example, if you have 500 likes on the page, and you order 100 likes, then delivery is completed at 600 likes. So we are looking purely at the counter. If you still have a campaign running, including, for example, a win promotion, then this can affect the counter and thus the number of likes you get. If you want to make sure you actually get the number of likes you ordered, we recommend that you stop everything temporarily. Once you get the number of likes, all promotions can resume.
In short, put ongoing campaigns temporarily on pause until your order is completed again.