[SmartCrawl] URL's not added to SiteMap

SmartCrawl on my website shows that there are 329 URLs missing in the site map. I tried running a plugin conflict test and cleared Hummingbird cache, but still the last crawl date is of August 18, 2018 10:59 pm.

I tried adding the URL’s using the SmartCrawl panel and then cleared the cache and ran a new crawl. I did this several times but still the issue persists.

I would like this to get sorted.