After installing VBseo, total links drop + Google problems

I have been running the VBseo Sitemaps since August on its own and it had about 350,000 links in total. After installing the full VBseo the total links dropped down to 210,000 links in total.

I also turned on the following option "If you have vBSEO, include old urls?", this bumped the total link total to over 400,000 however when Google processed the urls it returned errors for all of them saying it was too large/too many links or something to that effect.

How come the total links dropped after VBseo was installed and why does that option cause it to fail with Google? what can I do to correct this?

Its also down to 6 files instead of 9

maybe it's the duplicate url's with the stock vb?

disable the old urls. You only want that for about a week after you install vbseo. You're well past that.

the sitemap does NOT include private forums. That may be why you have a drop.