The 60.06k is unique visitors over the 30 days you have selected. The 3.36k is the number of unique visitors that day. If someone visits on 2 days, they will count on each day as a unique visitor but only once in the month.
Thank you, that makes sense now, I have been noting the wrong figure for the last 3 months , trouble is, I wanted the figures for each month, but that is not possible from the overview page. is there a way to get that figure ?