agree, the homepage has an issue should rank first and the homepage indexing is the problem i believe he is asking about.
doing a query for the domain name you see this is the URL that is showing
http://www.oxygenconcentratorstore.com/
not
http://www.oxygenconcentratorstore.com
so http://www.oxygenconcentratorstore.com/ probably has or had the title tag "Oxygen Concentrators" and no meta description so that is why you are not seeing the title tag and meta description as seen in the source of this page http://www.oxygenconcentratorstore.com, it's a different indexed page in Google.
a) 301 redirect the / to the non slash version
b) make sure you are linking to the non / version in sitemap.xml files
c) make sure the homepage logo and other places on the site that are linking to the homepage are doing so without the slash at the end
e) add the canonical tag to the homepage without the slash in it
f) when doing link building link to the homepage (if you must link to the homepage) without the slash.
g) slash of no slash it doesn't matter, just do it one way and keep it consistent
thumbs down that answer i dare you lol