If this has already been asked and answered please point me in that direction.
I'm using Sugar Professional 9.01 and this occurs with I.E, Edge, and Chrome.
The issue I'm seeing is that when merging records you can slide the "Primary" label to the right and the radio buttons will appear correctly. But if you change your mind and slide the "Primary" label to the left the radio button selections no longer appear correct. Additionally when you use the radio button to select a value different that that of the value of the "Primary" record it overwrites the displayed value for the "Primary"
There are work-arounds the end user can follow but it's a process that is prone to create a lot of errors.