triage oddity: why did same PR show up in two consecutive weeks

[pnkfelix]

2023-05-23 triage used this url: https://perf.rust-lang.org/?start=3ea9ad532474343426e564b997891e459cda89a6&end=cda5becc27cbc7106646fbc40aacea5e7896d954&absolute=false&stat=instructions%3Au

2023-05-30 triage used this url: https://perf.rust-lang.org/?start=cda5becc27cbc7106646fbc40aacea5e7896d954&end=1221e43bdf413f7c405e9b17ef19d76c88222098&absolute=false&stat=instructions%3Au

why did PR rust-lang/rust#111807 show up in both triage runs? The end of the first is equal to the start of the second, so one would think that would imply that the PR would fall into at most one of the two ranges, not both.

[pnkfelix]

cc @Mark-Simulacrum