iCloud data not adding up

Hello all, my phone has not been backing up for a month. Today I went to check it out and saw some odd things there. Basically the numbers are not adding up, it says there is 32.7 GB of backups, but when I open it there is only one phone of 15.9 GB. Then when I open that backup the apps in there do not at all add up to that 15.9 GB. Does anyone know what is going on here or if there are some hidden files I didn’t think of?