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Just a guess but are you using an Android device by any chance? If so, It's quite a common problem with them, It all comes down to how the internal storage is partitioned.
The easiest thing to do first is go to settings and look for "storage" or "memory", open it and look for cached data when you tap it, it should clear any unnecessary data from there.
If that still isn't enough then to try to move as many apps as possible to an SD card, that should hopefully do the trick!