Bing - Webmaster Tools SEO Report

I have an established site that has been getting great traffic for a few years now. However, Bing traffic is lower than it should be. I'm using the Bing Webmaster Tools to debug, and it shows a number of "High Severity Errors". Could the following errors be so severe they are kicking me out of search results?

Error #1 = "The Description is too long or too short."

Error #2 = "The <h1> tag is missing"

Error #3 = "There are multiple <h1> tags on the page"

These seem super minor to me, especially the first one since they'll truncate the description if its too long. Trying to figure out if these are the reason Bing gives me ~1 click a day while other search engines are massively higher.