Trackid is a setting which, when you perform searches on Google, can integrate itself into the address and prompt searches with the word trackid despite your intentions. To be more specific, the exact address inserted into your URL is trackid=sp-006, here is an example of what the URLs might look like:
https://www.google.de/search?q=how%20to%20remove?trackid=sp-006
By following this link Google will perform a search on the term how-to-remove?trackid instead of how-to-remove.
Obviously this is not normal behavior and this cannot be attributed to your browser or Google. The responsible party is the parasitic program, probably adware that has made a home in your computer. This adware works with trackid to record your Google searches to a remote database.
This trackid and the adware associated with it could have been installed on your computer when you downloaded a free program. Sites like 01net, Softonic, Clubic, etc. use modifications to change their installation programs to accept these unwanted programs by default. Be sure to customize your installation and deselect any programs you do not want to avoid harmful software.
The adware that caused the presence of trackid in your Google searches could also have been installed if you updated a fake software update, like Java or Flash, or a fake program (video player, codec packages) that circulate around streaming and download sites.
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