Happened to me quite often when I was doing SubQ.
You can:
Try and inject as deep Sub Q as possible. I noticed that the lumps were worse when I injected close to the skin.
Second option, which worked very well for me:
After you have placed finger on injection site for approx. 20-30 seconds. Rub and knead the site for 30 seconds or so. Do it again maybe an hour later.
Because its oil that is meant to be injected IM, I think it is “pooling” in the subQ tissue, and being absorbed slower, causing some inflammation in the surrounding tissues. I think rubbing it helps move it around a little instead of keeping it in a big knot.
This either completely fixed the lumps, or made them almost unnoticeable.