Avast stopped replying to False Positive (FP) reports a few months ago. Whilst as an Avast User, I think this is counter productive as it is likely (as in your case) to result in more reports on the same URL.
The only guarantee is that they will investigate the report within 48 hours. If it is found to be an FP, it will be removed from the database, otherwise it will remain on it, which would appear to be the case here.
As there are no details in this post on the alert such as, site, what the alert is, etc.
The best way to show this attach a screenshot of the Avast Alert with the Details option selected, then those avast users with some experience can try and see why Avast 'might' be alerting.
Of course you may not have Avast installed, in which case you could post the URL/domain name with out the prefix https etc. so the link to a suspect sit isn't live.