Icons inconsistency (borders,corners)

Is this blizzard issue or some local caching issue ?

If it is the former, why cant such a large company create such a simple thing properly.

https://preview.redd.it/uo2yrw3hzn0h1.png?width=855&format=png&auto=webp&s=4b97d26e8d04afee76d4c397eab4a5eaf16cf083