Change my flash drive back to normal?

My flash drive recenly went from have 14.93GB to 527MB

After looking around i found that it split into 2 partitions

so how would i change my flash drive back to normal?

Is one partition about 6MB?  If so that is normal.  It’s a U3 device. 

If not then who partitioned the device?  If not you who else has access to it.

no, the 2 partitions are 527MB and 14.41GB

You need a software that can repartition the drive, try formatting the drive using HP Disk storage format tool (google it). Remember to take a backup before you start the process.