Southeast Vancouver Island is a known spot for this — you're close enough to the US side that your phone can latch onto an American tower without you going anywhere.
Those "1 minute" entries are just how an Easy Roam trigger shows up on the bill — it doesn't mean you made a call. A sent text, a bit of data, or dialling voicemail is enough. If there's a 99999 entry beside it, that's the Koodo/Telus marker for the triggering event.
Once you receive the pdf bill. Download the PDF bill, check pages 3 and 4 to confirm the dates, then submit them through Ask us to review a charge in Self Serve: https://www.koodomobile.com/en/help/ask-us-to-review-a-charge-on-your-bill — accidental roaming like this normally gets credited. Since there are two charges and that tool only handles one at a time, I'll flag a rep for the second.
To prevent it: turn data roaming off and manually select Koodo in the network list instead of automatic.