Hi @Aisleen,
You have some nice abstracts there, and I'm sure after little corrective action, you will be able to get them through.
You will need for all of your work a property release. The moderator does not guess that the work is yours, so they need to refuse on that basis. If you attach a property release to each of your artwork, you won't get refusals for that reason any more (IP related). To be honest, all of your pictures should have been refused on this basis.
116 does, however also expose a lot of dust. Scanning a dark surface really makes the dust visible. Certainly, that is considered a defect that leads to a refusal. You need to do some clean-up work, first before scanning and then digitally after the scan to get also the last leftovers.

Surely, the dust is also present in the less dark submissions, but it's not prominently visible, if at all, in the scan. Dark background and light reflecting dust makes it a good contrast with your scanner. If the scanner has a hardware dust recognition system, it would be worth to try that out. Software dust reduction makes your picture less sharp.
The moderator considered the 2 submits 96 and 11 as similar, and so he or she refused one of them. They are similar, as you state yourself and yes, they are different, but not different enough in the appreciation of the moderator. Here you should really not submit similar artwork and for sure you should not submit it in the same batch.