Because I flew when I shouldn't have!
Partialled my CPL. Came from a system where if it was within limits, you went on test. If the examiner judged it was too difficult, he would stop the test. Then had the frustration of delays due to weather/illness, a test cancelled due to weather, another not complete due to gear failure.
Came to complete, the weather was in limits, in fact ideal. However as we taxied ATC reported 6kts gusting 21 as a squall came through. Afterwards my examiner said she was surprised I continued, and did not delay for an hour, and I see that I should not have; however habit is ingrained, the wind was within limits if rather tricky.
Everything went OK until my glide, when the gust hit me as I turned final a little low anyway, and seemed to drive me relentlessly down. Nearly made it, but needed power at the last minute to get down.
Moral of the tale is don't press on into bad conditions, if they seem poor bin it early by choice, complete later.
Best of luck!