did some search on Google, and found some stuff about it.
hope it helps.
https://answers.ea.com/t5/Battlefield-4/My-emblem-won-t-switch-on-BF4/td-p/7901360/page/2
the current bug, is a bug that consists of the BF1 Companion App/Site
emblems taking precedence over the BF4 Emblems. Once you "make your own" BF1
Emblem and assign that to be yours, overriding the "premade" ones and delete it..
You will have NO BF1 emblem, and be able to use your BF4 ones again.
and some people say this.
if you are representing a platoon on BF1, If so unrepresent and that may work.
to change your emblem, you have to change it here too. https://www.battlefield.com/companion/career
1 - go to https://www.battlefield.com/companion/career
equip whatever non exclusive emblem that you have,
maybe even an old one from bf4 battlelog, it should be there,
if there is none, make a new one and equip it, then delete it.
2 - if you have a platoon, then set a new active platoon and choose to wear tag and emblem,
if u dont have a platoon, make a new one, make a random temp emblem and set the platoon active.
3 - go to battlelog >>> emblems and choose/make a different emblem.
