Viking Web Site question on Grand European Tours

We are booked on Eistla June 5, 2016

Noticed that both the Eistla and the Bestla were removed from the Viking web site.

They are both June 5, 2016 departures. Eistla departs from Budapest, Bestla from Amsterdam.

When I called Viking, was originally told that they (Eistla & Bestla) were sold out.

Later phone calls to Viking confirm availability on both cruises and the customer service agent I spoke to said an internal email went around saying both cruises were going to be pulled from the web site. No explanation given to me.

Just curious, why would Viking remove these cruises from the Viking web site before they are sold out?

Any ideas? Is this a normal thing?

Thanks in advance.

UPDATE:

After being reassured that the Eistla would still be our ship and after the date which air fare can be decided and booked (and it was), Viking decided to reassign (their words) the June 5 sailing of the Eistla and they put us on a different ship with a different departure day.

Not a biggie, nobody got hurt. Just an update.