Find usages functional is worked weird.
Try to find footer.js usages and there are three unnecessary results. It's weird. When you try to find something like index.js (most common file name in the project), IDE finds all folders and other places like variables.

WebStorm 2019.1 (191.6183.63)
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you must have enabled Search for text occurrences in find usages settings... Please open Edit > Find > Find Usages Settings... and clear the checkbox - does the issue persist?
Nothing has changed, with enabled checkbox and without
can't recreate with Search for text occurrences disabled. Can you reproduce the issue in a new project?
Yes, I have this issue on new project too
Please can you share this new project (including its .idea folder) and your IDE settings ( File > Export Settings)?