First, bitcoin's value is very volatile. It can go up or down even in few hours. The factors affecting the price of bitcoin is supply and demand of the crypto. If there's a lot of people buying and using bitcoin then its price will definitely go up. With the current dips, its maybe because of the new fork that's happening to BCH. Some bitcoin investments were transferred to BCH hoping that they can get something out of the fork which is likely to happen.

Don't panic because the value of bitcoin will correct itself few weeks from now.