There are a few reasons for that..

The less likely situation is that your backlinks aren't indexed by Google. To get them indexed faster, you can ping and/or bookmark you links considering thy're not already bookmarks.

The more likely situation is that SEO Small Tools' web crawlers haven't crawled your links. Services like these have 'crawlers' crawling the links all over in internet and come back with the data. Not all companies have the same amount of resources and SEO ST aren't up there with the top-dogs.

For better link analysis, you should consider using Ahrefs. They have the best crawlers in the industry are far better than MajesticSEO and Moz's Opensiteexplorer.

However, not all links would be shown by these services. If you really need the whole link profile, you should consider using Google Webmaster's Tool. Just add your site to you account and in 2-7 days, you would be able to see the all the links pointing back to your site along with lots of additional useful data in regards to your site.

Please you will check your back link in webmaster tool where you can get all backilinks if you links cache .

First i prefer to use web master tools and then use siteexplorer.info

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I agreed with the folk.

It may be the situation that your backlinks aren't indexed by Google. Or the crawlers of that website which you are using for checking backlinks haven't crawled those links.

Please check your backlinks in the webmasters tool, Ahrefs, Opensiteexplorer.com or alexa.com.

Backlinks checkers do not and cannot report every link that every website gets.

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Google not chche & indexed all back links.if we create 100 back link then Google indexed only 15-20 links only if your back link are best . according this visit your back links and visit that are indexed & cache use by many tools . and use this website which are cache & indexed in weekly .

Sometimes backlinks shown in tools like ahrefs,majestic,OSE,small seo tools may vary. If you want to know the exact amount of backlinks yor site had got, then you need to check in google webmaster tool>search traffic>links to your site https://www.google.com/webmasters/tools/external-links

Well, its showing you only two because those backlinks still needs to be crawled give it some time things will start increasing and one more thing I would say you can get the information about the backlinks available over the Google Webmaster Tool other than ... using some third party tools as I seriously doubt about their statistics they are not that much accurate. Better option would be using Google Webmaster Tool or you can also use tools like webmeup, ahrefs ..

PS: Don't worry give sometime to the crawlers to get back to you !

Its Will depending upon the Tools , Once you can check with Backlinkwatch , Its for better tool for Analyzing your Back-links

There are many tools that you can use in checking your back links. Remember, there are links that are not yet indexed by Google so it is best to bookmark and ping them. You should tell Google about your links so it will going to index.

They could be still not indexed by Google. You should wait more