AbuseFilter statistics are reset every 10000 actions. This affects the "Of the last 5,045 actions, this filter has matched 0 (0.00%)" on filter pages, and "Of the last 6,321 actions, 0 (0.00%) have reached the condition limit of 1,000, and 50 (0.79%) have matched one of the filters currently enabled." on AbuseFilter main page.
The limit of 10000 is hardcoded in AbuseFilter::recordStats().
10000 actions is literally a couple of minutes on more active Wikimedia wikis like Commons or English Wikipedia. This makes it useless for knowing the long-term impact of filters, or for knowing whether filters are bumping into the condition limit.