Taplio publishes your scheduled posts in your account timezone, not in the timezone of your computer or browser. If the two are different, a post can go out earlier or later than you expected.
Check and change your account timezone
Go to Settings > General.
Under Timezone ("Used for scheduling and date display"), pick the timezone you want your posts to follow.
Click Save.
The timezone is used everywhere in Taplio: the times in your Post schedule, the time you pick when you schedule a post, and the dates shown in the app.
What about posts I already scheduled?
After you change the timezone, open Write & Schedule > Post schedule and check the times of your upcoming posts. If one is not at the time you want, open it and pick a new time.
Travelling or working with clients in other countries
Set the timezone of the audience you post for. If you manage someone else's account (through Organizations or account sharing), each account has its own timezone in its own Settings > General.
If a post still went out at the wrong time after checking this, send us a message in the chat.