I assume you're clicking the "Switch back to old look" link? If so, make sure you select Vector legacy (2010) and save your preferences.

If Vector 2022 is still re-appearing after doing so, try turning off Twinkle/any other userscripts and gadgets before re-enabling legacy Vector.

The change is gradually taking effect between 15:30 and 16:30 UTC. During this time, individual pages do appear in the new skin or the old skin, as we are deploying in multiple stages. Since we are currently rolling out in stages in order to minimize server load, we are updating the skin default in four stages, which is affecting local preferences. Local preferences will work once again as expected when the deployment is completed, in about 20 minutes.

In T327298#8535577, @ovasileva wrote:

The change is gradually taking effect between 15:30 and 16:30 UTC. During this time, individual pages do appear in the new skin or the old skin, as we are deploying in multiple stages. Since we are currently rolling out in stages in order to minimize server load, we are updating the skin default in four stages, which is affecting local preferences. Local preferences will work once again as expected when the deployment is completed, in about 20 minutes.

Thanks.

@Poodle23: Is this still an issue?

In T327298#8550544, @Aklapper wrote:

@Poodle23: Is this still an issue?

Nope.