Sidecar and upload problem

[ProximaNova]

I successfully uploaded 387 images to a Danbooru website, but I had to fix like 200 or more of them since the sidecar files didn't work and none of the posts had tags. Each sidecar file looked like this:
"tag1
tag2
tag3

source:http://website.com/index.php?abc=123
"

Notice how there is a blank line before and after the source tag. It is odd because some worked (as in resulted in a post which had all of the tags from the sidecar file) and some did not (meaning the posts had no tags/only had system-added tags). This oddity happened even though they all had the same format and the correct filename in order to work.

In the log it said "[1:12] Image filename.jpeg was successfully uploaded." But when I tried to upload "filename.jpeg" without using the userscript / the normal way "filename.jpeg" uploaded there as if it hadn't been upload there before. This was the only text file I found which deviated from the norm: there was like 3 blank lines at the very top of it.

I'm not sure what is causing this, but I think it might be excessive newline characters, uploading many images at once, or communication errors.

If you have a problem like mine, please post here. Also, check your log vs. your account Upload Limit: if it says, for example, "Finished uploading; 387 uploaded ok + 41 failed = 428 images total." then the account limit from before you started uploading (initial) compared to what it is now should be initial+387.

[ProximaNova]

Update: I just found out that it looks like none of the sidecars worked for that batch of 387 images. I'll be doing further testing to see what went wrong.