Tonight I did a check in with both my local club's net on their repeater repeater (65 miles away) and a half an hour later with the Canadian club across the border's net. The Canadians were very friendly, welcomed me in, and said I was blasting them with clear audio from the long distance, even with the hills working against me rather than to my advantage. My reception of them was rather poor, and hearing them was a slight issue. All in all, my second net of the night was working well. However, as the net went on, and the more I talked, a problem began to occur. Some of my transmission was lost, and I quickly assumed my Alinco 85 watt transceiver was overheating, which is a known problem with the model. This still may very well be the case. However, I also noticed that on my later transmissions, I wasn't just getting the Hayfield, Manitoba's signal, but every time I transmitted later in the net Bismark, ND's repeater on the same frequency. I didn't hardly believe it, and thought it might be some other interference, but eventually out of the garbled interference I did hear Bismark. By all appearances, I was somehow triggering a repeater 145 miles away. I ask the experienced hams here, what happened? I cannot believe that even my decent setup (85 watt transceiver, G7-144 antenna) with my height in the hills could have done such a thing? Was the overheating Alinco doing something it should not have? Was I getting a rare phenomena to get the reach and effect? Why was I having clear communication with the local repeater at first, and then the far off interference later? What can I fix? I suppose this is a good lesson in the problems of omnidirectionals, insomuch that you will end up getting signals on frequencies you don't want, and a directional has value in not taking in signals from certain directions. I guess it shows the power of band plans, and how I am in a unique situation tonight to actually have problems despite good plans (albeit in different countries). And how neither repeater has a tone, making weak signal contact easier, but also meaning this kind of situation was possible in the first place. Any guidance on this is welcome, and thanks in advance.