Got it! There are a few possible explanations for what's going on, but the most likely is simply that the links you've gathered—primarily through social network accounts—aren't being seen by the Mozscape index, and so aren't showing up in OSE.
Mozscape's crawler focuses on breadth rather than depth. What that means is that it'll only follow links on any given site so deeply. That allows us to index more sites, but it means that some very deep pages aren't going to be crawled.
In the case of social networks and business directories, just about any outbound links to individual sites are going to be too deep for Mozscape to index. There are just too many listings, and there's a whole lot more internet out there!
This generally works out, since there's little if any ranking value in those links—they're not earned—and since the purpose of them tends to be for traffic or for local SEO, rather than for building link count.
To build DA, you'll need to focus on building links from high quality, high authority, relevant sites.
Does that make sense?