[Python] python os.renames create chaotic results

So I want to rename mp3 Files using their own Meta Data and sort them out (with/without metadata) and get sketchy results and a weird FileNotFound Error while he does the statement (picture follows)

sketchy Result -> one of 2 songs is renamed properly, but the other one gets their own title split while one part is part of the name and the other part is kinda a new subDirectory!?

Error -> FileNotFoundError: [WinError 2]

The python code, it's really short

print("Start")

tracks = []
tracksMeta = []
tracksNoMeta = []

source = os.path.join(os.getcwd(), "testSongs") #os.getcwd()
dest = os.path.join(source, "ohneMeta")
destM = os.path.join(source, "mitMeta")

print(source)
print(dest)
print(destM)
print(os.path.exists(source))
print(os.path.exists(dest))
print(os.path.exists(destM))



if not os.path.exists(dest):
os.makedirs(dest)
if not os.path.exists(destM):
os.makedirs(destM)

for root, dirs, files, in os.walk(source):
for index, name in enumerate(files):
if name.endswith((".mp3",".m4a",".flac",".alac")):
tracks.append(name)
try:

temp_track = TinyTag.get(root + "\\" + name)

#metadata available
if temp_track.title and temp_track.artist:
print(index, name, "->", temp_track.artist, "-", temp_track.title)
tracksMeta.append(name + "->" + temp_track.title + "-" + temp_track.artist)

#rename
if os.access(source, os.W_OK):
print(temp_track.title)
print(temp_track.artist)

newname = temp_track.title + " - " + temp_track.artist + ".mp3"
if os.path.exists(source) and os.path.exists(destM):
os.renames(os.path.join(source, name), os.path.join(destM, newname))

#or not
else:
tracksNoMeta.append(name)
#move
if os.path.exists(source) and os.path.exists(dest):
os.renames(os.path.join(source, name), os.path.join(dest, name))

except TinyTagException:
print("Error")

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