My application storage is 63gb but system information says i still have 95gb free out of 120gb

Help needed. Was checking my storage capacity at the About this Mac and it says i have 63 gb of storage for application. What's weird is that it still say i have 95 gb of free storage out of 120gb. Apparently that 63 gb storage increases by 1.5 gb everytome i open garageband. I checked using omnisweeper and surprisingly it says i only used 22gb of my storage out of 120 gb. Tried uninstalling garageband but the storage for application does not decrease. Please do advise what should I do next.