(Q) root folder size topic

I am on MJ7, rooted with Safestrap. I softbricked my phone and did the no-wipe method of restoring my phone. My root folder size used to be a total of 1.5 GB. I noticed that after restoring my phone it was .97 GB. I thought something had gone wrong so I backed up in internal memory onto my pc and did a full-wipe restore. I still have .97 GB total for my root folder. What am I doing wrong? How can I get it back to 1.5 GB?