When I go to Esior's Haven and go to town barracks, sometimes the barracks turn into Sanctuary of Saerielle's barracks. I only have to refresh the page to get it back to Esior's Haven town barracks, and after that the problem seemingly doesn't come back until I close all tabs from Sylestia or shut down my computer. It started just after the 4-5 (I think) scheduled maintenance, but I don't know if it's been happening for longer.

My guess is that you have multiple tabs open with both cities. When you load a city, whether it's Esior's Haven or the Sanctuary of Saerielle, the game updates which town you are in. However, there's no restrictions on entering those towns. So with each page request on a town, it's updating your in game location.

So if you load Sanctuary of Saerielle. Then on a separate tab, load Esior's Haven. Then go back to the Saerielle tab and click on something, it will respond thinking you are in Esior's Haven.

That's most likely the case, thanks Krin