The links ARE setup like this Link to your product

I am confused on how it knows to briefly direct to Shareasale. In this source code there is nothing that looks out of place. It looks like a completely normal link except it does contain the verbiage class="external-link" other than that it looks regular. These links are ALSO showing up in webmaster tools as DO FOLLOW.

I am not sure if this is completely true, however I contacted Shareasale about these links. I asked them if I were to close my Shareasale account, they said the link would then just directly go to me. The anchor link is indeed directly pointing to my site. I am not sure how google can read that it is affiliate looking at source code alone?

There are websites that have linked to my site. Whenever I hover over link I see my direct website URL and I am not seeing "no follow" when viewing source code so I assume these are passing link juice. However when I click on link it directs briefly to shareasale (affiliate account) in web address bar, but then quickly directs back to my website URL as directed. I was curious if these good links I am acquiring truly pass juice or since they briefly pass through an affiliate site if that cancels or dilutes the link juice. Also I am noticing when inspecting element that after the HREF it says class="external-link"

I am just not sure if my link building efforts are being ruined by having an affiliate account running.I did not tell them I had one. I guess they are searching to see that I have one and trying to make a few extra commission dollars.

I have an e-commerce website and am trying to create product category pages. I am under the impression that Description is the text that would appear under the title on a google search and I believe the meta description is just what google reads? Is having BOTH important or just description? Is it ok to duplicate the description for the meta description? I know its not good to duplicate descriptions on other products and pages.

I am currently using magento and have all titles labeled correctly. I have made a H1 tag for the main page which works fine. Each product title becomes and H1 tag, which again is fine. However my category pages are missing H1 tags. If I manually code an H1 tag, then there becomes 2 H1 tags. It is using my category name then my manual H1 tag. I don't want it to use my category name because it is shortened to fit on my navigation bar.
Ex. www.mydomain.com/tshirts/short-sleeve 
In this example the subcategory title is short sleeve. When using MOZ tool on frontend it shows NO H1 tag or the title becomes H1 tag "short sleeve" however I want the H1 to actually be "short sleeve tshirts"
If I manually add an H1 tag to description on category page it adds both the title AND the H1 tag I enter.