Recently, I was looking at a question, and these are the voting buttons:
I have a page, opened earlier today, which shows different formatting.
Was there an intentional change?
This was an intentional change by SE to "graduate" the voting button styles across the network. You can see the main meta post for it here: We are graduating the updated button styling for vote arrows
This experiment has been graduated. The new styling for vote arrows is now live across the Stack Exchange network.