This shouldn't be possible, but by removing a like on your own study, and then quickly liking it and then removing the like, the study can have -1 Hearts. Also, you can obtain an extra heart on your study by quickly removing the like and then liking the study similarily quickly.
Here is an example for -1 Hearts.
lishogi.org/study/e2K8uA5v
Here is an example for 2 Hearts.
lishogi.org/study/wFEDYtGF
This should be patched.
-1 Hearts
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