When searching with freetext, QBank weighs the matches according to set rules. This is done to produce the most relevant results first, so you won't spend unnecessary time sifting through the results.
Weights are ranked from A through D, with the option to exclude entirely with the rank 0. Titles always have a set weight of B. Miscellaneous meta data, embedded in the media, always have a set weight of D. The weight of properties is defined by the creator. By default the weight for properties is C.
The weight of properties can not be changed by the user after creation due to being a processing heavy operation which should only be performed when one is absolutely certain. If there are any changes you wan't to make, please contact the support and detail the changes you wan't to make and it will be done for you.