positioning doesn't work with custom template starting with a comment

I have a positioning issue when using custom template that starts with a multi-line comment like that:

```

```

Notifications are always display on the top left:

- positionX parameter is ignored
- I haven't test with positionY but it's probably ignored as well
- if I have several notifications, instead of being visible one after the other (as a list), only the last one is visible and I have to close it to see the previous one.