Quoting from the respective tag wiki entries:
floats: "The {floats} tag concerns custom-made floats in addition to those already provided by the TeX macro package you use, and concerns issues such as positioning, labelling, indexing, captioning and listing. Use the {tables} or {figures} tags when asking questions about the standard LaTeX floats."
tables: "The {tables} tag deals with tabular and array environments and related packages. If your question is about floating or placing, use the {floats} tag instead."
figures: "This tag is to be applied to floats created with the
figure
environment, and deals with issues such as positioning, labelling, captioning, indexing and listing of said floats. Similar issues, but with custom defined floats should be tagged with floats."
In other words: The wiki entries for floats and tables contradict each other.
The underlying problem seems to be that we never properly differentiated between floats and the possible content of floats:
Floats could be categorized into tables, figures and other (custom-built) floats.
Typical float content would be a tabular environment or a graphics.
Our floats and figures tags are in accord with the float/float content distinction. On the other hand, the tables tag wiki actually describes tabular& friends, and the questions tagged with tables cover this particular float as well as its typical content.
Please suggest measures to get out of this tagging mess. Note that tag badges have been already awarded for tables, but not for floats or figures.