You could try clearing the GW2 cache; no idea if it would help. https://help.guildwars2.com/hc/en-us/articles/231273908-Troubleshooting-Trading-Post-Wizard-s-Vault-Errors
No one else has posted about encountering this 'bug'. 🤷♂️
Which expansion(s) did you purchase? Did you purchase in-game or through the site? If through the site, did you receive an email with your Serial Key? If not, you may have to contact the CS Team via the 'Support' link above/below.
Some resources:
The GW2 Wiki - link above https://wiki.guildwars2.com/wiki/Main_Page
https://www.guildwars2.com/en/new-player-guide
https://wiki.guildwars2.com/wiki/Extended_Online_Manual
Welcome to Tyria and good luck.