Google Search Console Performance Report Compare Feature Buggy
Briefly

Google Search Console has a bug impacting the date picker functionality, often defaulting to the last month of data, which causes confusion among users.
Alli Berry's initial report highlighted the issue where GSC only allows performance comparisons for the last month versus the previous month, causing persistent redirection problems.
Tory Gray observed that using a longer date range in GSC sometimes leads to identical graphs for different periods, further complicating data analysis and understanding.
John Mueller acknowledged the problem and mentioned he would escalate the issue, expressing hope for a quick resolution to restore expected functionality.
Read at Search Engine Roundtable
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