I don't believe in such things, come man maybe it was just a coincidence that the marks had happened always on Monday. For me the best day to buy bitcoin is when you see it on sale and you have the money to buy at your fullest.
We would not know unless we take a look for at least a month? Chart sometimes could be deceiving but we have at least to take a look with ourselves. Besides, if this might be just a coincidence then these coincidences were good as we could take more profit by just buying every monday, and then sell in the following days that will arrive as long as the market gone higher.