What is the ruling on sounds and movements from the anus not accompanied by an odor, and are they considered actual wind that invalidates ablution, especially when one is not certain of their emission, and given their frequent occurrence?

It appears you are experiencing obsessive thoughts regarding anal discharge. The cure for this is to ignore them and pay them no mind. As long as you doubt the emission of ritual impurity, the default is that your ritual purity remains. Therefore, do not pay attention to these sounds, complete your ablution and prayer, and do not repeat them, as that is a manifestation of obsessive thoughts.