Why such a difference in external followed links details?

[iThinkMedia]

I love using seomoz and have done for a few years. I am no SEO expert, but like to think I can get away with making out I know what I'm on about!

I use opensiteexplorer regualrly and usually enjoy delving deeper into it's metrics, but one thing is bothering me (before I start with this, please forgive me if I am missing something obvious - you may have to point it out in your answer!)

So I run a comparison of a few sites and pay attention to the external followed links section. On checking this number at root domain level, company A has 12,666 external followed links. So I want to dig a little deeper as to the qulaity of those links and click along to the inbound links tab, here I select the following:

"followed & 301" > "only external" > "all links to this root domain" > leaving the results ungrouped

Downloading this table I only have results for 3,416 links - why such a big difference to the previous 12,666 or am I missing something here?

Would just like a bit of clarification

[Anita_Clark]

Is the 9K difference the no-followed external links pointing to the site?