If the avocado has a strange smell after being roasted, it may be due to the following reasons:

1. The avocado has deteriorated before roasting, resulting in a change in taste.

2. During the roasting process, the avocado was overcooked, resulting in a burnt smell.

3. The avocado is not ripe before roasting, resulting in the flesh not being soft enough.

In order to ensure the taste and quality of avocados, it is recommended to check whether the avocados are ripe before roasting, and control the time and temperature during roasting to avoid over-roasting. If the avocado smells strange after being grilled, it is recommended that you pay attention to the above points the next time you try to grill it to get a better grilled avocado experience.