Welcome to the Q&A Forum

I saw a severe drop in MozTrust for multiple sites I am working on. We have added some links this month, but would be considered 'spammy' or to be low quality. No other links appear to have been lost / removed. If we had some very high quality links before and have added some mid-level links can this be what is causing the drop? From the description on SEOmoz, it seemed to me that trust could only go up as links were added. It appears that I am missing something.