Sudden Index drop, but traffic increased?

[EcommerceSite]

Here are the numbers-

Pages submitted on sitemap- About 18k

Total Pages indexed on 12/30- About 250k

Total Pages indexed on 1/6- About 81k

We made no site changes in that week, why the sudden drop? Also why is total pages indexed so much higher than sitemap?

[irvingw]

need more info to make that determination, at very least the URL.

you can  look at your analytics and take a look at what pages were bringing traffic and now what pages are driving most users to it to answer the traffic question.

the indexing question is more of a technical question that would need to be looked into from a coding and content perspective on your site

[EcommerceSite]

I can't do the url but I have access to everything. Traffic is up since that happened, it hasn't hurt us at all. No landing pages have lost traffic. We got a completely new site in early November, is this just that site going away and being replaced with the new one?