johnwrites:

Can you explain further?

It sound as if you are manually downloading and installing the spybotsd_includes.exe file (Detection updates yyyy-mm-dd) from the Downloads - The home of Spybot-S&D! and then doing an integrated update within Spybot-S&D.

Is that true?

If that is that case the download from the Downloads - The home of Spybot-S&D! is an external change and is not recognized by the integrated update facility within Spybot-S&D. In other words the two update methodologies do not work together. The Downloads - The home of Spybot-S&D! Web page indicates:

Detection updates yyyy-mm-dd - product description
md5: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

This updates the detection rules. Only needed if you do not want to use the update function integrated into Spybot-S&D.
If you are in fact doing both types of updates, note the statement in the spybotsd_includes.exe download:

Only needed if you do not want to use the update function integrated into Spybot-S&D.