Whether one H1 tag or multiple H1 tags are appropriate has been a topic of debate, but the fact of the matter is that multiple H1 tags on-page is perfectly fine in SEO.
What is an H1 tag (SEO)?
A webpage has headings, and the H1 heading is considered the most important heading. One H1 heading tells the bot and the reader what the entire article is about. Multiple H1 headings are indicative that the article has multiple topics.