And I have 2 Hummer in the Garage.
You have two (or more) <H1> tags on one page? That's not illegal in any way, but the SEO preference is to have only one (to show the most important section). You need to know which page it is on. I don't think that OC normally sets more than one on a page -- perhaps you installed an add-on or extension that provided a second one? Once you see it looking at the page source (Ctrl+U on many browsers), you may be able to figure out which PHP file is providing it, and edit that file to change it to <H2>.
Basically, you would look around each H1 to see what it's displaying, and see if there is some sort of "theme" to it that would suggest an extension you added. It might help if you can compare your store to a "stock" (vanilla) OC store, to see what's different. If you can't find it that way, you should have a copy of your store on your PC for backup purposes. Search for H1 (or h1, if that's the case it's in) using a tool such as findstr (on Windows) or grep (on Linux). Figure out which ones are on the page in question, and change the less important one to H2 or H3.
If you can't do this, you'll need to hire someone to do it for you. Post in the commercial requests section.
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