Canada has refused to cooperate with border control; and has been very uncooperative in terms of negotiating reciprocal tariffs. Most Americans that are paying attention to the tariffs are tired of playing nice with Canada.
I had a recent deal fall through purchasing a guitar from a Canadian shop, as the shop was unable to get it through Canadian customs, according to UPS. The shop tried twice to ship it, both failed to clear Canadian customs; US Customs never received custody of the item. It was over a month in duration, when I finally asked for my refund, which I received. So, yes. I'll blame Canada for this too.