我在这个冒泡排序代码中找不到逻辑错误

I'm attempting to do a simple bubble sort code to get familiar with list/string manip & method use, but for some reason, when I attempt to iterate through each value in the list to remove white space and values that are non ints, it skips some. I haven't even gotten to the bubble sorting part..I'm attempting to do a simple bubble sort code