If you have multiple encounters on the same day, encounters are not sorted in the same way under the Encounter and Form Entry tabs on the patient dashboard.
For example, if you add four encounters, all with today's date, on the patient's Encounter tab, the four encounters will be listed in the order that you added them. (ie, the encounter you added last will be at the top of the list).
However, on the Form Entry tab, there is no such guarantee, and the encounters are likely to be listed in another order.
I don't know what the rule is/should be for ordering encounters that are from the same date, but sorting should be internally consistent between the two tabs.